The actress was positively glowing as she showed off the honey-blonde shade at the Beverly Hills launch of her maternity clothes collection for a Pea In the Pod maternity wear.
This was after debuting the new 'do on the Ellen DeGeneres Show, where she talked about life as a mother and wife.
Jennifer has come over from the dark side with a new blonde hairstyle.
Jennifer's new look is markedly different from the raven locks she sported previously with a blunt fringe. She appears to have been growing out the style, which was cut to just above her shoulders last August.
Jennifer regularly updates her style – she's been blonde before and has also dyed her hair red, looking great each time.
With this latest 'do She follows in the footsteps of Cher Lloyd and Hilary Duff – who have both lightened up their hair colour recently.
The actress showed off her new blonde tresses at the launch of her new maternity clothes line.
Jennifer told Ellen that her baby daughter Autumn, who was born in November, is "fantastic".
"She's sleeping better now, not so much in the beginning, which was a little rough. But, she's a great sleeper now," added the 35-year-old.
The star also told how she married Autumn's dad, her Client List co-star Brian Hallisay "just five days" before the baby was born.
"It was very, it was really sweet and he's an awesome, incredible father and a great husband and I just feel really lucky," she said.