While Beckinsale was in a relationship with actor Michael Sheen, she reportedly begged director Len Wiseman to cast Sheen in the film Underworld in which she was the star. While the pair were on set, both her and Wiseman, who was also married to a kindergarten teacher, apparently began having a relationship. Everyone involved was adamant that there was no infidelity, however Wiseman's first wife was the only one who supposedly disagreed with this statement. (Wikipedia)
The pair got engaged in June 2003 and married on the 9th May 2004 in Bel Air California. They now live together in Los Angeles and are still friends with Sheen. He said; "Len is a really lovely man. He has been a fantastic step-father for Lily, I couldn't really want anything better for my daughter." (Wikipedia)
Wisman became stepfather to Beckinsale's daugher Lily Mo Sheen and he even gave Lily her own 'wedding ring' on the day they got married.
Beckinsale recalled; 'I didn't go looking to marry an American, it just kinda happened like that. ' (IMDB)
In November 2015, it was announced that the pair were separating and Wiseman filed for divorce in 2016.