After a late-night 21st birthday bash at Tao Las Vegas, Rumer Willis followed up the festivities with a more intimate celebration the following evening: She held a family dinner at Koi inside the Planet Hollywood Resort & Casino. Joined by dad Bruce Willis, his wife Emma, mom Demi Moore, stepdad Ashton Kutcher and her sisters Tallulah and Scout, the starlet pre-selected dishes from the restaurant's menu for the meal. The group – which also included family friends – assembled in the Fountain Room for the private feast, which ended with Rumer blowing out all the candles on her cake after a "Happy Birthday" serenade.

The night before her album release, Kelly Clarkson and 12 friends popped into Koi New York. The singer and her pals laughed and enjoyed drinks and dinner. Clarkson ordered baked crab and rock-shrimp hand rolls and the yellowtail tuna tartare – and she left her server a huge tip!

Talk about making an entrance! Slumdog Millionaire's Freida Pinto earned a round of applause as she walked through the door at Koi Los Angeles for dinner with her costars. While diners were thrilled to see the Oscar winners, Pinto and her pals were having a great time, too. The group (including Anil Kapoor) "was constantly laughing, taking photos and celebrating," an onlooker tells us.

Eva Longoria Parker, stepping out for sushi with pal Mario Lopez at Koi Las Vegas. In Sin City to celebrate hairstylist pal Ken Paves's latest salon, the two squeezed in a quick meal in the restaurant's Fountain Dining Room. The Desperate Housewives star ordered extra-spicy tuna with crispy rice, along with yellowtail sashimi, among other dishes. On the way out, they stopped by the bar to check out a basketball game on television.