What happened in Vegas didn't stay in Vegas for LeAnn Rimes and Eddie Cibrian this weekend. The couple – in town for Rimes's three concerts at the LVH Hotel – was spotted all over Sin City, enjoying the temptations the town has to offer.

Friday afternoon, Rimes met a girlfriend for a bite at Public House at The Venetian. The singer sipped a Joseph James beer and a Maker's Mark on the rocks, and split a burrata appetizer with her pal before tucking into a spinach salad with chicken. According to a witness, she spent most of her lunch chatting on her phone.

Friday night, Rimes linked up with her husband, his sons and a group of 10 family members for dinner at LAVO. A source says the crew enjoyed a selection of signature dishes, including Kobe meatballs, and that Rimes and Cibrian were spotted "sharing a few private kisses" throughout the meal.

During her stay, Rimes also managed to indulge in a little pampering at COLOR – A Salon by Michael Boychuck inside Caesars Palace. The singer – decked out in a beaded Parker dress and Jimmy Choo heels – enjoyed a blowout and manicure while chatting with staff, and posed for a few photos with Boychuck before ducking out of the salon. – Melody Chiu, Jennifer Garcia and Mark Gray

It seems Sin City is the place to be this New Year's Eve.

Celebrities like John Legend, Guns N' Roses and members of the Kardashian family are set to ring in the New Year on the Las Vegas Strip. Across the country, Lady Gaga will kick off the countdown to midnight in New York's Times Square.

But that's only a taste of all the stars toasting the arrival of 2012. Other celebrity New Year's Eve Events include ...

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Las Vegas Italian eatery Lavo was the place to be: Lauren Conrad shared dinner with her business partner and some friends while in town to launch her new fashion line. Meanwhile, Glee's Mark Salling ate at the restaurant on the same night before heading upstairs to Lavo Nightclub, where he invited revelers to his table and signed autographs. Alicia Keys's hubby Swizz Beatz was also at the club, and he had champagne delivered to his table by a bevy of waitresses.

Rihanna was solid gold in a sparkling dress while celebrating her female artist of the year award at a star-studded Billboard Music Awards bash at LAVO Las Vegas. Making her entrance near midnight, RiRi held court as industry pals and other winners congratulated her on the night, where she opened the show with a duet of her hit "S&M" with Britney Spears. Also at the bash: Mentor Jay-Z and Billboard Millennium Award honoree Beyoncé, Glee's Matthew Morrison, and Joe Jonas – who stopped by the DJ booth to get on the mic and say hello to the crowd.

Ashley Greene was dancing the night away with her Twilight costar Xavier Samuel at Lavo's grand opening in New York. The costars were literally by each other's sides all night, just laughing and hanging out. Upstairs, True Blood's Joe Manganiello dined with model-actress girlfriend Audra Marie, and the actor feasted on a special no-carb meal cooked especially for him because of his strict diet. According to an onlooker, the two "were really cute, kissing and cuddling the whole time."

Mary-Kate and Ashley Olsen, enjoying dinner and dancing together at Lavo, inside the Palazzo Las Vegas. After celebrating a friend's birthday with a meal in the private dining room, the twins headed upstairs to the club, where they snagged a table on the dancefloor. "They danced non-stop with their friends and playfully took photos of each other," says an onlooker, noting that the twins stayed until after 3 a.m. "They loved the music the deejay was spinning."

The next night, after performing in Las Vegas, Jay-Z and wife Beyoncé took over the private dining room at Lavo with their large group. Enjoying a celebratory post-show dinner, they shared some of the music mogul's Ace of Spades champagne, along with sushi and sea bass. After dinner, the group headed over to the nightclub, where they took over tables on the dancefloor, while revelers strained to get glimpses of the superstars, who partied until 4 a.m.