Ashton Kutcher and Mila Kunis were spotted packing on the PDA while attending a Backstreet Boys concert at the Sphere in Las Vegas on Aug. 2. The pair danced and sang along to the band's romantic 1999 hit 'I Want It That Way.

Kutcher and Kunis famously met while working together on the hit teen comedy That ’70s Show, where they played on-screen love interests from 1998 to 2006. Eventually, their romance translated offscreen, and they began dating in 2012, six years after the show ended.

Mila Kunis is reflecting on the intense physical and emotional demands she faced while preparing for her role in Black Swan. In a new interview with Vogue, celebrating the 15th an