Jennifer Aniston attends as Warner Bros. presents the World Premiere of "Rock of Ages" at the Grauman's Chinese Theater in Los Angeles, CA on June 8, 2012. Credit: Alex J. Berliner/ABImages via AP Images

She was a no-show at the premiere, but Jennifer Aniston didn't leave Justin Theroux hanging at the Rock of Ages after party at Grauman's Chinese Theater in L.A. Friday.

The actress, 43, looked radiant in a strapless white cocktail dress that showed off her toned arms and lean legs. Her boyfriend, Theroux, 40, co-wrote the Rock of Ages screenplay with Chris D'Arienzo and Allan Loeb.

During the star-studded soiree, the film's stars -- including Tom Cruise, 49, Catherine Zeta-Jones, 42, Russell Brand, 37, Malin Akerman, 34, Alec Baldwin, 54, Paul Giamatti, 45, and Diego Boneta, 21 -- watched Poison take the stage. "To be here with Catherine, Tom and everyone and having a party, that's an awesome day," lead singer Bret Michaels, 49, told Rolling Stone.

Earlier that evening, Theroux "was hugging and greeting everyone" on the red carpet, an eyewitness tells Us Weekly. After mingling with Mary. J Blige, 41, and director Adam Shankman, 47, the film's leading lady Julianne Hough, 23, "came up and hugged him and talked to him for a while."

The following day, Theroux and Aniston were seen arriving at the Charles de Gaulle Airport in Paris, France. The couple, who took their romance public in the spring of 2011, were photographed arm-in-arm under an umbrella Sunday.