There have been rumors circulating since September that they are dating.

And now it seems those rumors may be true as Seth MacFarlane, 44, was spotted going out to dinner with actress Halston Sage, who is 20 years his junior.

The couple, who co-star in darkly comedic Star Trek prequel The Orville, were seen dropping into celebrity hot spot Sushi Park in West Hollywood on Thursday evening.

No hiding it: Seth MacFarlane, 44, was spotted going out to dinner with actress Halston Sage, who is 20 years his junior, seeming to confirm rumors that they are dating

They seemed to be in good spirits, smiling as they made their way up to the second floor of the outdoor strip mall on Sunset Blvd.

Seth was entirely dressed in black while Halston wore a black skirt with white polka dots, a black cropped sweater and perilously high, square-heeled sandals.

The actor plays Ed Mercer, captain of the USS Orville, in the space saga set before Kirk and Spock boldly go about discovering strange new worlds in the first Star Trek.

New romance?: The couple, who co-star in darkly comedic Star Trek prequel The Orville, dropped into celebrity hot spot Sushi Park in West Hollywood on Thursday evening

Smiling stars: Although there were no PDAs, the couple looked very happy together

Halston plays the devoted Lt. Alara Kitan, The Orville's chief of security.

She is a member of the Xelayan race, which inhabits a high-gravity planet, giving her greater-than-human strength.

So Seth, who also co-created the show, had better watch his step with her.

Looking out of this world: Halston wore a black skirt with white polka dots, a black cropped sweater and perilously high, square-heeled sandals

Keeping it simple: Seth was dressed in black and carried a jacket as he walked next to Halston

The star hasn't been in a relationship since breaking up with Game Of Thrones actress Emilia Clarke in 2013 after six months together.

Halston can count Zac Efron among her exes.

Meanwhile, she and Seth will be blasting off to space together again for the upcoming second series of Fox's The Orville.