LOS ANGELES - Hong Kong actress Maggie Q made a high-profile, red-carpet debut with her rumoured boyfriend, Hollywood actor Dylan McDermott, at a Golden Globes after-party.

They stood close to each other as McDermott, 53, placed his hand on her back.

They were attending the InStyle and Warner Bros party held after Sunday's Golden Globe Awards ceremony at the Beverly Hilton in Beverly Hills.

Maggie Q, 35, was in a tight, backless black gown and he wore a black suit.

They have not publicly acknowledged their relationship, but a source told E! News in October that they were dating.

They have been seen together since September, when they were photographed shopping in Brentwood, California.

On social media, however, all their posts have been focused on promoting their CBS series Stalker, said E!.

In the police drama, which started airing in October, they star as detectives who work on stalking cases for the Los Angeles Police Department.

McDermott ended his 14-year marriage to actress Shiva Rose in 2009. They have two daughters.

Maggie Q was linked to former co-star Daniel Wu.