Louis Tomlinson and Danielle Campbell appear to be getting serious.

Photo: 1D's Louis Tomlinson Reunites With Girlfriend Danielle Campbell

Over the weekend, the One Direction singer and his actress girlfriend attended a pre-Grammys party in Los Angeles, and during the event, they made their affection for one another no secret.

“After a few drinks, he was stroking her hair, grabbing her butt and rubbing her back,” an eyewitness at the party told Hollywood Life on Monday. “He would also occasionally kiss her on the side of the head. She was loving every minute of it and he seemed to be having a great time as well. They are really a cute couple and you can tell that they are a thing.”

Is Louis Tomlinson Engaged To Danielle Campbell After Welcoming His First Son?

“Overall, their Valentine’s Day appeared to be successful and they seem very much happy an in love,” the source added. “They both respect each other and allow each other to be themselves and do their own things, but also spent time together—it looks like it will last.”

Just last month, Tomlinson welcomed a son, Freddie, with his former fling, Briana Jungwirth, and despite his hectic schedule, and relationship with Campbell, a source recently claimed he was very hands-on.

“Louis has yet to tackle changing diapers but he’s working up to that. He is doing the best he can but it has definitely been overwhelming,” the source explained to Hollywood Life. “Louis is taking his role as dad very seriously. He’s been super involved from the get go. He’s very hands-on, changing diapers, holding and rocking little Freddie. Louis couldn’t be happier.”