PHOTOS — Weekend in Vegas: Robin Thicke after his pot bust; ‘Glee’ kids; Diddy; and Neil Patrick Harris’ romantic date

Hot off his arrest on a pot possession charge in New York, Robin Thicke played piano and sang at the opening of Bellagio’s Lily, then walked across the hall to club Bank to sing some more. This is at the Bank. Courtesy photos by Denise Truscello/WireImage.

Also at the Lily opening: Cee Lo, Eliza Dushku with boyfriend Rick Fox, Ne-Yo, and H.O.T.T. DJ Alexandra Richards. Courtesy photos by Denise Truscello/WireImage.

Diddy, Lenny Kravitz and Common performed at 1 Oak on Saturday. Courtesy photos by Denise Truscello/WireImage.

UPDATE ITEM: John Legend and T-Pain performed at 1 Oak in a charity fundraiser for the UC San Diego Nevada Cancer Institute, late Sunday night. Courtesy photo by Denise Truscello/WireImage.

Trey Songz sang Saturday at the Palms’ Pearl. Courtesy photo by Bryan Steffy/WireImage.

Neil Patrick Harris and his man David Burtka went to "Zumanity" Saturday. Courtesy photo by Nichola Halsey/Cashman Photography.

Sammy Hagar launched a new rum at his Cabo Wabo Cantina Friday. Courtesy photo by Denise Truscello/WireImage.

Ricki Lake, Mark Ballas, Robin Antin, Matt Goss and Pamela Adlon hung at Pussycat Dolls Burlesque Saloon. Courtesy photo by Jeff Bottari/WireImage.

“Glee’s” Amber Riley celebrated a birthday at Tabu, with Gabourey Sidibe, on Saturday. Courtesy photo by Isaac Brekken/Getty Images.

See this kid? He’s Porter Robinson, he has a new DJ residency at Surrender, and he’s 19. This is from Saturday night. Courtesy photo by Bryan Schnitzer.