Published: 22:08 BST, 30 December 2013 | Updated: 11:40 BST, 31 December 2013
She has admitted in the past to following a strict running regime to maintain her slender figure. And Katie Holmes showed off the results of her hard work on Monday.
The 35-year-old displayed her toned physique as she stripped down to a hot pink bikini while lounging poolside with daughter Suri in Miami.
Suri, 7, enjoyed a hamburger and a little ballet poolside, an unusual combination, but she certainly showed off some talent as she struck a series of poses.
Fighting fit: Katie Holmes stripped down to a hot pink bikini while lounging poolside with daughter Suri in Miami on Monday
Catching a tan: The 35-year-old was seen shrugging off her green flannel shirt before lying down on the sunlounger
Keeping it casual: She pulled her dark hair back into a loose bun and appeared to be without make-up, shielding her eyes with large sunglasses
Simple elegance: The star wore two delicate gold necklaces, one that said 'Love' and the other sported an arrow pendant
The actress was seen taking off her blue flannel shirt before lying down on a sunlounger.
The mother-of-one looked in phenomenal shape, sporting athletic legs and a flat tummy.
She pulled her dark hair back into a loose bun and appeared to be without make-up, shielding her eyes with large sunglasses.
Katie wore two delicate gold necklaces - one spelled 'Love' and the other sported an arrow pendant.
Yum! Suri was seen munching on a hamburger for lunch after dancing around the swimming pool
Dedicated to her craft: Suri shows off her dancing skills poolside to impress her mother who is also a keen dancer
Dance like no one's watching: Suri seemed caught up in the moment as she showed off her perfectly pointed toes
Fun in the sun: Suri looked adorable in a polka dot Hello Kitty two-piece as her famous mother kept a watchful eye on her
The former Dawson's Creek star appeared to be having a ball as she grinned while chatting to someone on her cellphone.
After her chat, she showed a friend her phone, presumably something funny judging by her pal's expression.
At one point, Katie was seen covering her tummy with a white towel, perhaps feeling a tad self-conscious.
Natural beauty: Katie opted to forgo wearing make-up for her day in the sun
Who's that you're talking to? Katie giggled as she chatted to someone on her phone
Time to relax: Katie looked to be taking full advantage of her time off as she stretched out on her sun chair
Suri, meanwhile, looked adorable in a polka-dot Hello Kitty two-piece.
She was seen prancing around the pool before sitting down to enjoy a hamburger for lunch.
Katie was later seen pulling on a pair of denim cut-off shorts and the same green shirt from earlier as she got ready to leave.
Having a laugh: Katie continued to have a giggle while chatting on the phone after covering up her tummy with a white towel
Check this out: After her chat, she showed a friend her phone, presumably something funny judging by her pal's expression
Serene: Katie looked utterly at peace as she laid back and soaked up the sun
Earlier this month, the Go star has been seen taking Suri to school almost every other day after the pair were recently separated while she filmed her new movie The Giver in South Africa.
The film is based on the sci-fi tales by Lois Lowry about a boy living in a seemingly perfect community without war, pain or choice, who learns from an elderly man about the pain and pleasure of the 'real' world.
Next up, the actress is set to play the lead in Responsible Adults, opposite former Gossip Girl heartthrob Chace Crawford.
Natural style: Katie was seen rolling up her sleeves as she stood waiting for Suri
Time to go: The actress was seen pulling on a pair of cut-off denim shorts and the same green flannel shirt as she readied to leave
Feeling shy? Katie was spotted earlier wearing the shirt over her bikini as she made her way to the pool
Mummy and me time: Katie looked relaxed and happy as she enjoyed the company of her only child