"Evan never left Ashlee’s side," an eyewitness tells ET. "She was snuggling up to her husband all night long.”After the soiree, Ashlee took to Instagram to share how grateful she was to hang with her ride or dies. On her official birthday, Evan shared a very sweet throwback photo of the pair in all their bohemian glory."HAPPY BIRTHDAY!!!! Framing her face with super light, bleach blonde locks, the mom of two looked like a total rock star in a black jumpsuit, studded leather jacket and strappy silver sandals. This picture is from one of the first trips we ever took together to CABO. A post shared by Evan Ross (@realevanross) on MORE: Ashlee Simpson's Daughter Jagger Marks Second Birthday with Vinyl Art, Bananas and Andy Warhol-Themed Cake! Ashlee's last few birthdays have all been close family affairs. Her husband, Evan Ross, stuck close to her side the whole night, looking just as dapper himself in an all-black ensemble topped with a navy blue velvet blazer. I already new then I wanted to be with you forever!
The son of legendary singer Diana Ross proposed to his girlfriend of seven months while on a Hawaiian holiday and Ashlee took to Twitter on Monday to share the happy news and a picture of the huge engagement ring.
Simpson had slipped into a long black coat for her Los Angeles outing, a black leather purse with diamond stitching slung over her right shoulder.