LOS ANGELES, Feb 19, (Agencies): Rooney Mara and Joaquin Phoenix are expecting another bundle of joy! On Friday, the actress, 38, arrived at the 74th Berlinale International Film Festival and cradled her growing baby bump while posing for pictures on the carpet.

The Carol star chose to wear a stunning strapless, floor-length gown with black draped material that subtly showed off her bump for the event, which was in support of her new film, La Cocina. Joaquin, 49, and Mara already are parents to son River -- who was born in 2020 and is named after Joaquin's older brother, actor River Phoenix, who died at the age of 23 from an overdose in 1993.

The name of the couple's first child was revealed by Russian filmmaker Victor Kossakovsky, who -- while premiering a film at the Zurich Film Festival in September 2020 -- announced the name to the audience. "He just got a baby, by the way," Kossakovsky said at the time, "a beautiful son called River." Mara and Joaquin first met while working together on the set of Her, which was directed by Spike Jonze and written by Joaquin. In the movie, he plays a writer who falls for Samantha, an artificial intelligence Operating System voiced by Scarlett Johansson -- but not before his relationship with Catherine, played by Mara, comes to an end.