They've yet to officially announce their relationship.
Close: Kendall Jenner and Ben Simmons certainly looked very cosy at his birthday dinner on Friday night
While others can be heard singing Happy Birthday along with Kendall, only she is close enough to fit in the shot.
The KUWTK star dressed very sexily for the occasion, rocking a sheer black top that showed off a black lacy bra beneath.
As Ben smiles at the attention, Kendall leans across and cosies up to him.
HB2U: A video clip shows the model sitting at the basketball player's right hand as he is presented with a birthday cake to celebrate his 22nd birthday
Showing off: The KUWTK star dressed very sexily for the occasion, rocking a sheer black top that showed off a black lacy bra beneath
Cosy: While others can be heard singing Happy Birthday along with Kendall, only she is close enough to fit in the shot
Kendall and Ben were first spotted together in late May during outings in New York City and Los Angeles. At the time, Page Six claimed they were dating 'for a few weeks.'
One person who probably wasn't at Ben's birthday — or maybe she was? — was his ex Tinashe.
She turned up at Drake's birthday party on Wednesday where Bendall were hanging out — reportedly her third time to do so so far this summer.
First it was at Delilah in June; then Poppy in early July, before the threesome crossed paths once again at Delilah.
It's even been reported Simmons is hiring extra security because he feels Tinashe is 'obsessed.'
Tinashe first revealed her romance with Ben in mid-March; they parted ways two months later in May.
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