Sabrina B.

Trent Richardson — the #3 overall pick in the 2012 NFL Draft — turned 21 years old last night … and to celebrate, dude hit up a trendy Hollywood restaurant with an Oscar Winner.

The Cleveland Browns running back had his birthday dinner at Mercato di Vetro … alongside Jamie Foxx.

It’s unclear how the two know each other … but they’re probably both in town for the ESPYS tonight.

We’re guessing Foxx paid for dinner … since Richardson has yet to sign his NFL contract.

TMZ