Los Angeles: Actor Taylor Lautner attended the LA premiere of his "Twilight" co-star Kristen Stewart's upcoming movie "American Ultra".

Taylor Lautner and Kristen Stewart
Taylor Lautner and Kristen Stewart. Pic/Santa Banta  

The duo was all smiles when posing for photographers at the screening, which took place on August 18, reported Aceshowbiz.

Stewart, 25, looked chic in a floral short jumpsuit by Zuhair Murad with a deep plunging neckline. She sported catseye eyeliner and donned black Jimmy Choo shoes.

Lautner, 23, opted for a semi-casual style with a white shirt, a blue suit and black pants.

Stewart was also joined by her "American Ultra" co-stars at the red carpet event.

She posed together with Jesse Eisenberg, Connie Britton, Topher Grace, Tony Hale and John Leguizamo for a group photo.

Eisenberg and Grace looked relaxed in jackets and jeans, while Britton showed off her fit body in a long white dress with sheer panels. Grace also brought along his fiancee Ashley Hinshaw.

"American Ultra" centres on Mike (Eisenberg), a seemingly hapless and unmotivated stoner whose small-town life with his live-in girlfriend, Phoebe (Stewart), is suddenly turned upside down.

Unbeknownst to him, Mike is actually a highly trained, lethal sleeper agent. In the blink of an eye, as his secret past comes back to haunt him, Mike is thrust into the middle of a deadly government operation and is forced to summon his inner action-hero in order to survive.

Directed by Nima Nourizadeh, the R-rated action comedy is set to open wide in US theatres on August 21.