Amelia Gray Hamlin, 19, puts on a very busty display in a tiny sports bra as she enjoys dessert

Amelia Gray Hamlin set pulses racing as she promoted the celeb-approved activewear brand, Alo Yoga, with her latest Instagram Story on Tuesday.

While enjoying a sweet treat straight out of a takeout box from the couch, the rising runway star put on a very busty display in a tiny sports bra and matching leggings.

‘dessert = gym,’ the 19-year-old model, who has been an longtime advocate for eating disorder awareness and body positivity, captioned her snap. 

Modeling: Amelia Gray Hamlin set pulses racing as she promoted the celeb-approved activewear brand, Alo Yoga, with her latest Instagram Story on Tuesday

She completed her outfit with several delicate chains around her neck and a silver bracelet, in addition to a beautiful and bronzed makeup look. 

In both photos, she looked carefree and happy as she posed on her side with a fork in her right hand and flashed her freshly painted nails. 

On Saturday, she and her boyfriend Scott Disick made their relationship Instagram official, just in time for Valentine’s Day. 

Busty display: While enjoying a sweet treat out of a takeout box from her couch, the rising runway star put on a very busty display in a tiny sports bra and matching leggings

Busty display: While enjoying a sweet treat out of a takeout box from her couch, the rising runway star put on a very busty display in a tiny sports bra and matching leggings

The 37-year-old Keeping Up With The Kardashian vet shared photos with Amelia as they cozied up next to one another while enjoying dinner at Carbone in Miami. 

Disick – who does not follow Amelia on social media and has never posted with her before – did not shy away from their budding romance, while seemingly gifting his gal an expensive piece of hardware.  

Linked since they arrived together at Kendall Jenner’s Halloween party in October, the pair have rung in numerous milestone holidays together including New Year’s in Mexico and now a Valentine’s vacation in South Beach. 

Instagram official!: On Saturday, she and her boyfriend Scott Disick made their relationship Instagram official, just in time for Valentine's Day

Instagram official!: On Saturday, she and her boyfriend Scott Disick made their relationship Instagram official, just in time for Valentine’s Day

Lavish gifts: Amelia who has been photographed wearing a more modest silver watch in months past, seemed to get the ultimate upgrade from Scott  as she flashed her gold Rolex

Lavish gifts: Amelia who has been photographed wearing a more modest silver watch in months past, seemed to get the ultimate upgrade from Scott  as she flashed her gold Rolex

While at dinner the pair took one serious and one smiley photo, as Scott captioned the series ‘Why so serious,’ before adding ‘Just kiddin.’ 

Amelia flashed a very expensive gold Rolex on her wrist – which seemed to be an early gift from Scott – as she has been photographed in months’ past with a more modest timepiece. 

Earlier in the day they spent some time on the open water, both posting from a speed boat on Biscayne Bay. 

Arm candy: The age-gap pair have been an item since October when they stepped out together at Kendall's Halloween birthday party

Arm candy: The age-gap pair have been an item since October when they stepped out together at Kendall’s Halloween birthday party

Scott looked every inch the nineties boy-bander with his icy spiked hairdo, as he was seen driving around in a flashy Lamborghini writing ‘Livin la vida Lambo.’

Last week, they were spotted getting a bit handsy on the beach, as he slid his hand around her waist and they held hands while strolling by the ocean. 

Despite having a string of much younger models on his arm since splitting from longtime girlfriend Sofia Richie over the summer, a source told E! News that the pair ‘looked very much in love.’ 

Sleepover: Amelia teased their ongoing relationship as she posted a stripped down underwear selfie from his Hidden Hills bathroom

Sleepover: Amelia teased their ongoing relationship as she posted a stripped down underwear selfie from his Hidden Hills bathroom 

A few weeks ago, Amelia seemed to not-so-subtly flaunt their ongoing relationship as she posted a stripped down underwear selfie from his Hidden Hills Bathroom.   

Though it was said in November that there was ‘nothing serious,’ about their romance, there is certainly something to be said for the amount of time they’ve spent together. 

Additionally Scott has made a real effort to blend his life with Amelia’s, getting close in recent weeks to her sister Delilah’s boyfriend Eyal Booker. 

Trouble? Reportedly not on board with the pair's enormous age gap, her Real Housewives mother Lisa Rinna and dad Harry Hamlin had expressed concern in the fall, citing Scott's previous 'baggage' as an issue

Trouble? Reportedly not on board with the pair’s enormous age gap, her Real Housewives mother Lisa Rinna and dad Harry Hamlin had expressed concern in the fall, citing Scott’s previous ‘baggage’ as an issue

Reportedly not on board with the pair’s enormous age gap, her Real Housewives mother Lisa Rinna and dad Harry Hamlin had expressed concern in the fall, citing Scott’s previous ‘baggage’ as an issue. 

‘She [Lisa] really does like Scott but both her and Harry don’t want someone that age with so much baggage to be with their baby girl, especially given Amelia’s own mental health issues,’ an insider told The Sun. 

Hamlin has been in recovery for an eating disorder for the past couple years, while Scott has a more known track record with regards to substance abuse.