3:45 PM PT -- A source close to Selena tells TMZ the two aren't dating, they were there separately to see different people, and their groups ended up hanging out together inside.
The pair were spotted leaving The Nice Guy in West Hollywood Wednesday morning. We're told Selena left out a back door and Tyga the front around 2:30 AM.
Sources say Selena arrived at the restaurant just before midnight, Tyga was already inside ... and it didn't appear that security let anyone else enter the club once the two were both together. Clearly, they were allowed to hang out past the closing time of 2 AM.
It's unclear what, if anything, is happening between Selena and Tyga ... but the pairing is interesting. We haven't known Selena to date anyone publicly in a long time.
Interestingly enough, it appears Tyga celebrated Selena's 30th with her and friends at a party last month.
We reached out to reps for both, so far no word back.
Originally Published -- 3:10 PM PT