Isabella Brewster is a first-time mum

Russell Brand's ex-girlfriend Isabella Brewster has given birth to her first child.

The former talent agent and her husband, basketball star Baron Davis, welcomed a son on Friday (22Aug14).

Davis took to Twitter.com to announce their child's birthday, and wrote, "S**t just got REAL!!!!! Wow!!! #BestDayOfMyLife", and, on Tuesday (26Aug14), both the sportsman and Brewster showed off their new bundle of joy on Instagram, sharing a photo of the sleeping tot swaddled in a blanket.

It's been an exciting year for the couple, who tied the knot in January (14), with a ceremony including Brewster's older sister, Fast & Furious star Jordana.

British comedian Brand dated new mum Brewster in 2012.