Wonder years actress Danica McKellar, 48, stuns in a leopard print bikini while posing by a waterfall in Costa Rica: 'So many adventures'

Danica McKellar made the rare move of posing in a leopard print bikini for Instagram on Tuesday.

The star, 48, has been on vacation in Costa Rica with her family.

The The Wonder Years actress shared a look at the location as well with all its beautiful flora and fauna. There was even a snapshot of a colorful tree frog.

'Costa Rica photo dump!! ✈️,' she wrote in her caption.

'My family and I had a wonderful time and many adventures! 

'Swimming, snorkeling, waterfalls, horseback rides, rainforest walks (that tree frog looks like a National Geographic - but that was taken on my phone!), and more.'

Still a 10: Danica McKellar made the rare move of posing in a leopard print bikini for Instagram on Tuesday. The star, 48, has been on vacation in Costa Rica with her family

Still a 10: Danica McKellar made the rare move of posing in a leopard print bikini for Instagram on Tuesday. The star, 48, has been on vacation in Costa Rica with her family

Hot in CR: The The Wonder Years actress shared a look at the location as well with all its beautiful flora and fauna. There was even a snapshot of a colorful tree frog. 'Costa Rica photo dump!! ¿¿,' she wrote in her caption

Hot in CR: The The Wonder Years actress shared a look at the location as well with all its beautiful flora and fauna. There was even a snapshot of a colorful tree frog. 'Costa Rica photo dump!! ✈️,' she wrote in her caption

Fame: Danica famously starred as Winnie Cooper in the coming-of-age series, The Wonder Years, which also starred Fred Savage as the lead character Kevin Arnold; the duo pictured

Fame: Danica famously starred as Winnie Cooper in the coming-of-age series, The Wonder Years, which also starred Fred Savage as the lead character Kevin Arnold; the duo pictured

'And that very last shot at the waterfall?

'Shout-out to @glebsavchenkoofficial for teaching me dance arms - if you wanna get better at something, you practice wherever you are!'

She added, 'We took some pics & video on my husband's underwater camera so once I get those, there might be a part two.

'Super grateful for the opportunity to make new family memories in a cool new spot, and I'm wishing you a week of making beautiful memories, whether on adventures, or right at home. ❤️'

Danica was born Danica Mae McKellar.

She is an actress, mathematics writer, and education advocate. 

She played Winnie Cooper in the television series The Wonder Years from 1988 to 1993, and from 2010 to 2022.

And she has voiced Miss Martian in the animated superhero series Young Justice.

In January she rang in her 48th birthday.

Family vacation: 'My family and I had a wonderful time and many adventures! Swimming, snorkeling, waterfalls, horseback rides, rainforest walks (that tree frog looks like a National Geographic - but that was taken on my phone!), and more'

Family vacation: 'My family and I had a wonderful time and many adventures! Swimming, snorkeling, waterfalls, horseback rides, rainforest walks (that tree frog looks like a National Geographic - but that was taken on my phone!), and more'

With her man: Seen with her husband and her son on a boat

With her man: Seen with her husband and her son on a boat

Not just beauty but also brains: She is an actress, mathematics writer, and education advocate

Not just beauty but also brains: She is an actress, mathematics writer, and education advocate

She is a good photographer! Danica also shared this crisp image of a tree frog

She is a good photographer! Danica also shared this crisp image of a tree frog

And to honor her special day, the actress displayed her seemingly ageless visage in an 'obligatory' makeup-free selfie that she shared to Instagram.

'Well hello there, 48! [heart emoji],' Danica began in her post's caption. '(Here's the obligatory #nomakeup, #nofilter shot)'

The former child star posed for the birthday snapshot on her couch. She had one arm tucked behind her head of brunette hair and a slight smirk on her face.

Danica went on to thank her friends and followers for their 'sweet birthday messages' before sharing her 'secret' to her youthful appearance.

'Wishing you all a beautiful 2023, and thank you so much for being on this journey with me,' wrote the star.

She reflected on her 2022 'journey' which included working on films with the Great American Family network, continuing her line of math books and her 'newfound faith, for which so many of you have been so encouraging!'

Ageless: She rang in her 48th birthday in January

Ageless: She rang in her 48th birthday in January

Health first: She then touched on the topic of healthy living - both mentally and physically - and how it's resulted in an abundance of 'inner joy'

Health first: She then touched on the topic of healthy living - both mentally and physically - and how it's resulted in an abundance of 'inner joy'

She then touched on the topic of healthy living - both mentally and physically - and how it's resulted in an abundance of 'inner joy.'

'If there's any secret I've found to youth, it's in the attitude... and a healthy, clean lifestyle, of course,' she wrote. 'Our minds and bodies are inextricably connected. I've found when I eat well and get enough rest and exercise, I have so much more access to that inner joy that makes life fun!

'And when I discipline myself to see good (and laugh at the absurdities) in the world, resisting the seduction of outrage addiction, I find I'm more likely to stay in gratitude and make healthy choices...like going to bed early instead of staying up late to scroll through... all the things there are to be outraged over,' continued Danica.

'The other secret to life? Taking all that gratitude and giving back to the world in as many ways as I can. My grandmother always said, "The way to be happy is to make other people happy." Spread it around...'

To conclude her message, Danica encouraged those who are 'so inclined to give me a birthday gift' to donate to one of her favorite charities. 

Soon after posting, Danica's comment section was flooded with birthday wishes, as well as comments about her natural beauty.

Full House alum Candace Cameron Bure - who contributed to Danica's decision to explore the Christian faith by gifting her a bible - wrote: 'Happy birthday Danica!!!! May God bless you abundantly this new year in ways unexpected'

Danica responded: 'Thank you! Same to you, my friend!'

Riverdale star Marisol Nichols' couldn't get over Danica's line-free face as she remarked: 'You look 20!'

Sabrina The Teenage Witch actress Melissa Joan Hart commented a string of red balloon emojis.

Danica is no stranger to the makeup-free, filter-free selfie as she also did it to honor her 47th birthday last year.

Danica famously starred as Winnie Cooper in the coming-of-age series, The Wonder Years, which also starred Fred Savage as the lead character Kevin Arnold.

The show aired on ABC from 1988 to 1993.

The show aired on ABC from 1988 to 1993; Danica and Fred pictured

The show aired on ABC from 1988 to 1993; Danica and Fred pictured

Since then, Danica has delved into voice acting and has starred in a number of TV shows and Hallmark Channel films.

She became a New York Times bestselling author after publishing a number of math books for kids.

According to the McKellar Math website, over a million copies of the books have been sold since 2007.

She earned a Bachelor of Science degree in Mathematics in 1998 after atten