Actress Lizzy Caplan and actor Tom Riley are engaged. An engagement ring was spotted on the Mean Girl's star's ring finger while the two were out and about in Los Angeles. A rep for Caplan confirmed that Riley asked her to be his wife in May. The two have been dating since January of 2015, where they met in London while Caplan was filming. Caplan's Mean Girl's co-star, Daniel Franzese, also recently got engaged. The two played the BFFs Janice Ian and Damian in the hit movie.