No, singer and actress Mandy Moore (born Amanda Leigh Moore on April 10, 1984 in Nashua, New Hampshire) has been married to musician Ryan Adams since March 10, 2009, and there are no media reports of recent divorce filings by either Mandy or Ryan.
She did appear in Love, Wedding, Marriage (2011), though, a film in which she played Ava, a marriage counselor who's parents decide to get divorced, which throws her for a loop.
This year she's appeared in the TV movie Family Trap, the short Tangled Ever After, and the TV series TRON: Uprising. She'll also be appearing in the film Hotel Noir later this year.
In mid July She announced that she and Ryan would be working on an album together. Since he has a recording studio, the plan is to record there, and they've already been writing together, though she's said that she's not sure she wants to do a duet with him, and a joint tour is not likely.