Will Arnett and his girlfriend, Arielle Vandenberg, have officially called it quits.

The 45-year-old Arrested Development star and the 28-year-old actress have split after dating for six months, multiple sources confirmed to Us Weekly on Tuesday, June 23.

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Will and Arielle at the Golden Globes after party in January 2015.

"They're still friendly," an insider revealed of the pair. "It was never really serious."

RELATED: Amy Poehler Gets Candid About Her Divorce From Will Arnett

Will and Arielle first started dating in January and made their public debut as a couple at a Golden Globes after party on Jan. 11. "She loves to laugh. The past few girls haven't been fun enough for him — he's a child at heart," another source said of the duo.

will arnett and amy poehler

Will and his ex-wife, Amy, in January 2010.

Will was previously married to Parks and Recreation star Amy Poehler, 43, for nine years from 2003 until 2012. The former couple have two sons together, Archie, 6, and Abel, 4. Since their divorce, the actor has also been linked to celebrity chef Katie Lee and producer Erin David.