Kellan Lutz and AnnaLynne McCord
07/19/2010 AT 06:00 AM EDT
, celebrating her 23rd birthday at Nobu West Hollywood with her two sisters and
rumored beau Kellan Lutz
, along with two other pals. The six sat in the main dining room, laughing, eating and drinking as McCord opened her presents. After dinner, a cake was brought out and the gang sang "Happy Birthday." According to an onlooker, she and Lutz had "obvious chemistry."
and Josh Duhamel
, enjoying a set by jazz/dub act, Thelonious Dub, in the lounge at West Restaurant & Lounge atop L.A.'s Hotel Angeleno. Duhamel was especially enthusiastic, cheering on the band, while Fergie also said how much she loved then. The two also bought the band's CD and snapped a picture with another guest before taking off.
, hanging out at Las Vegas's Hard Rock Hotel & Casino's Beach Club with athlete beau Matt Kemp
. The singer also popped into Vanity Nightclub to help a friend celebrate a birthday, arriving around 2 a.m. for the celebration. Rihanna danced up a storm while her songs played in the club. The group also celebrated with bottle of champagne.
New dad Cristiano Ronaldo
and girlfriend Irina Shayk
partied at Provocateur in New York four nights in a row! The two snuck in the back door and were spotted kissing and dancing together until the wee hours, an onlooker says.
Miami Heat's Dwyane Wade
and girlfriend Gabrielle Union
, arriving at the Summer Groove Comedy Jam at Hard Rock Live in Hollywood, Fla., with their arms around each other. The couple sat in the front row for the show, and "were fun and flirty," a source says, adding that they even laughed when the comedians on stage made fun of them. The night before, the duo dined at Martorano's Italian American Kitchen.
By JENNIFER GARCIA, LINDA MARX, LESLEY MESSER