Monday

Couples Watch: Jessica & Tony, Zac & Vanessa ...

01/12/2009 at 06:00 AM EST

• A super social Jessica Simpson, enjoying a night out – and makeout session – at L.A.'s Bar Deluxe with beau Tony Romo. The two were spotted cuddling together on the couch late into the evening, and they laughed as they gazed into each other's eyes before their big PDA session. Before her beau arrived, Simpson was focused on her female friends, including CaCee Cobb, who was at the club with boyfriend Donald Faison, and sister Ashlee. The pop star danced a lot – grinding to tunes like Britney Spears's "Circus" – while her younger sister (who re-dyed her hair red) sipped a sugar free Red Bull and kept everybody company.

• Vanessa Hudgens and Zac Efron, enjoying an 11-course dinner at XIV in Los Angeles. Don't worry, all the food wasn't just for them: The adorable couple dined with four friends. "They were in a great mood and really enjoyed the meal," says an onlooker. Nearby, Sidney Poitier and Guess owner and designer Maurice Marciano dined on the chef's menu, and even brought their own wine to dinner.

• Following the Critics' Choice Awards, Brad Pitt and Angelina Jolie headed to one of their favorite restaurants, the Dakota inside the Hollywood Roosevelt Hotel. The lovebirds dined à deux. "They were having a very nice romantic dinner," says an onlooker. "They loved the food."

• Mariah Carey, hubby Nick Cannon and R&B singer Estelle, partying at Japonais in New York City for friend's birthday. With 20 other party guests, the group took over the restaurant's mezzanine, where they drank and ate the night away. Carey sported a body-hugging dress and her usual Gucci high heels and looked "like a million bucks," general manager David Patten tells us.

• Nicky Hilton and David Katzenberg, sharing a low-key dinner at Izakaya in West Hollywood. The couple ate sushi rolls at a table near the restaurant's front door, totally unfazed by people coming and going. According to an eyewitness, at one point, "David made Nicky laugh so hard she had to cover her mouth. They could not have been more in their own world."

• David Spade and Nicollette Sheridan, eating at Koi in Los Angeles. The couple sat on the back patio with their four friends surrounding them. After dinner, the two stood outside the entrance together. Uncharacteristically shy, Sheridan "hid under a black cap" as they waited for their ride.

• By SHAYNA ROSE ARNOLD, JENNIFER GARCIA, MARY MARGARET and LESLEY MESSER