07/27/2010 at 04:00 PM EDT
, arriving arm-in-arm with wife Danielle
at Las Vegas's Bank Nightclub inside the Bellagio during a night out with three other couples. The singer tried to keep a low profile and ordered water at his VIP table. An onlooker adds that he couldn't keep his eyes off his wife. "He seemed very protective of her," the source says. The couple also danced close, and Jonas fist-pumped, Jersey Shore
style, to the song "Let It Rock."
, avoiding her ex Nate Lowman
at the Arizona Iced Tea-sponsored afterparty for the band Edward Sharpe & the Magnetic Zeros
in New York. The starlet was just enjoying the party's vibe and dancing with her friends, though she never interacted with Lowman – even though she was supposed to be seated at his table.
New mom Tiffani Thiessen
headed on a relaxing weekend trip to the W Hotel in San Diego, where the actress was spotted in the Living Room lounge, just enjoying the scene.
let the waiter pick out her entrée while lunching at Dallas's Bread Winners Café and Bakery with boyfriend Miles Austin.
What did she dine on? An egg-white burrito with sausage and American cheese. The two were also tucked away in the back of the restaurant, away from other diners.
By DARLA ATLAS and JENNIFER GARCIA