The TOWIE star and Little Mix singer have been rumoured to be dating for weeks.
Jesy was previously engaged to Rixton singer Jake Roche, but the couple ended their relationship in November of last year.
On Sunday Jesy had posted a photo of herself on Instagram holding the Nickelodeon Kid’s Choice award Little Mix had just won.
She captioned the image: “You only went and b***** did it! Thank you so much to our incredible fans for making this happen tonight we truly are the luckiest girls in the world we love you so flippin much.”
Clark then commented on the picture writing, “My girl” followed by a heart emoji and clapping hands. Clark also liked another of Jesy’s pictures and commented with two heart eyes emojis.
A fortnight ago Clark had sent the rumour mill into overdrive when he posted a pic with Jesy on Instagram and wrote: “I don't want this girl to go back America tomorrow!”
In November Jesy split from fiancé Jake Roche and in an interview earlier this year, she hinted at the pain she had experienced over the break-up. Speaking on radio show Z100 Jesy said: “When you break up with someone it’s awful. It’s like one of the worst pains. It’s horrendous.”
Turning her attention to Little Mix’s breakup anthem ‘Shout out to My Ex’, she then added: “We all love to have some kind of sad song that we sit and cry to, but at the end of the day you need something that makes you feel empowered…That’s exactly what ‘Shout Out To My Ex’ does.”