Rex USA 1 / 6

Red-carpet official! Naya Rivera and Big Sean went public with their romance in a joint affectionate appearance at the Los Angeles premiere of the new Jackie Robinson movie, "42," on Tuesday.

The "Glee" actress, 26, and rapper, 25, made their debut on the red carpet by posing with their arms around each other. Rivera, who plays Santana Lopez on the hit Fox show, looked gorgeous in a gray form-fitting dress with a cut-out neckline and white pumps. Big Sean wore an all-black leather jacket, dress shirt and slacks ensemble.

PHOTOS: Love lives of 'Glee' stars

The "My Last" rapper had fun with his new girlfriend on the red-carpet and struck a couple of silly poses. The twosome were rumored to be dating late last month, after Rivera attended Big Sean's surprise birthday party and exchanged a few flirty messages on Twitter, the Daily Mail reports.

PHOTOS: Hottest 'Glee' guest stars

Rivera certainly isn't the only "Glee" star making headlines lately. Us Weekly broke the news on April 3 that Rivera's former girlfriend on the Fox smash, Heather Morris, is expecting her first child with boyfriend Taylor Hubbell. "I haven't been working as much, so I didn't really find out," Rivera told ET Canada last weekend. "I think she'll be an amazing mom. She's an amazing person."

PHOTOS: 'Glee' star's yearbook pics

Just two days earlier, "Glee" star Cory Monteith publicly announced on April 1 that he has checked himself into rehab for substance addiction, and Rivera says she wishes her co-star well. "Cory is such a great human being, and he's so genuine," she told ET Canada. "He's always been nothing but amazing to me and everybody that we work with, so I'm really proud that he is taking steps to get healthy, and I wish him the best."


Fashion don'ts

Celebs who've removed romantic tattoos

Christina Aguilera's worst looks