The Forgetting Sarah Marshall star separated from his pop star wife Katy Perry in December (11) and the couple's divorce was officially finalised on Monday (16Jul12) - and now it appears the funnyman has moved on from the failed relationship with the Dallas star's sibling, Hollywood agent Isabella Brewster.
The couple was spotted enjoying a stroll at the Pacific Palisades market and a source tells UsMagazine.com, "She is all over him and Russell loves it. It's been going on for a few weeks. He really likes her."
Brewster was last linked to actors Bradley Cooper and Milo Ventimiglia.
Perry is also back in the dating game - she was photographed kissing Florence + The Machine guitarist Robert Ackroyd at the Coachella Valley Music and Arts Festival in April (12) and the couple has continued its spring romance.