To celebrate, Mark's sister Samantha Ronson, 31, and her gal pal Lindsay Lohan, 22, joined the happy couple at Los Angeles Indian vegetarian restaurant Paru's.

Sam and Linds are pictured here leaving the eatery, en route to hip Tinseltown hangout Bardot. LiLo really appears to be enjoying parading around town with her latest chaotic hairstyle.

Even Sam looks to be growing her locks out, after getting the mop cropped short in the summer.

Tennessee Thomas fits right in with this musical "It" crowd. Mark, 33, produced tracks on Amy Winehouse and Lily Allen's last albums, Lindsay released two records of her own, and Sam is a superstar DJ.

But Tennessee, who is the daughter of Elvis Costello's longtime drummer Pete Thomas, is also a musician in her own rite; she plays drums herself for pop rock band The Like.