Seyfried, who previously dated her Mamma Mia! co-star Dominic Cooper, was first linked to Reese Witherspoon’s ex-husband in October (10) after they met at Kate Hudson’s Halloween party.
They were caught Christmas shopping together in Hollywood before the holidays (Dec10) and now the new couple has been snapped in a loving embracing during a break on the Los Angeles set of the upcoming sci-fi film.
The photo, taken earlier this week (begs03Jan11) and published on Usmagazine.com, shows the stars smiling and cuddling with Seyfried still in costume, donning a cropped red wig for her role opposite co-star Justin Timberlake.
The pictures emerge a week after Phillippe congratulated Witherspoon on the news of her engagement to Hollywood agent Jim Toth.
The Cruel Intentions co-stars divorced in 2007.