04/15/2008 AT 06:00 AM EDT
, chaperoning her look-alike daughter Leni, 3, to a birthday party in Beverly Hills.
star Jennifer Morrison
, celebrating her 29th birthday in Sin City with 15 pals including Prison Break
's Amaury Nolasco
, at the Hard Rock Hotel & Casino. After dining at Ago, the group took the festivities to Body English, where Morrison was brought on stage and serenaded with "Happy Birthday" by the entire club.
, having a guys' night out with two buddies at Villa in West Hollywood. The trio began the evening lounging over quiet conversation in a reserved booth, but got louder and more animated as they enjoyed rounds of shots as the night wore on.
, hosting Aura Nightclub in the Bahamas' first anniversary party. The former reality TV star-turned-actress was joined by Hilary Duff
, sharing cocktails and dancing the night away in the club's Round Room while taking turns snapping photos with fans throughout the night.
star Sarah Chalke
, casually dressed in a halter sundress, shopping at Fred Segal in West Hollywood. She was sans engagement ring, but not to worry – the actress's rep says she's still engaged to longtime boyfriend Jamie Afifi. Despite the 90º weather, Chalke purchased a pair of jeans and a black zip-up hoodie.
By JEN GARCIA and LISA INGRASSIA
Monday's Couples Watch >