And the 19-year-old continued, sharing her reaction when the reality TV starlet called her out:
[Image via Glamour Magazine.]
The couple that grabs ass together stays together… right?!
It looks like one couple started their SEXY Valentine's Day celebrations early! LOLz!!
Kat and her mixmaster boo also dined at Urth cafe before heading back home to take that ass-grab to its logical conclusion…
Or so we speculate!
Ch-ch-check out MORE adorable snaps of Kat and her Mau5's saucy WeHo adventure (below)!
[Image via Ramey Pix.]