Rachel McAdams was out and about in London this past weekend sporting an unexpected accessory -- a huge baby bump! Don't get too excited! The actress isn't pregnant in real life, but she will be in her upcoming film About Time, which she is currently filming (hence the bump). But boy did she sell her faux pregnancy.

Rachel recently joined the cast of the film, opposite male lead Domhnall Gleeson, about a man who can travel back in time and eventually finds the girl of his dreams.

Rachel McAdams Films Movie 'About Time'

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So does this mean there is baby on the brain for Rachel in real life? It's quite possible. The 31-year-old actress has been dating Michael Sheen since 2010 and has said several times in interviews that she wants kids someday. But Michael already has one 13-year-old daughter Lily (with ex Kate Beckinsale), so perhaps the fatherhood ship has sailed for the 43-year-old actor. Surely playing a very pregnant character will bring up the "baby talk" between the couple. We'd love to see an IRL pregnant Rachel, but there's a part of us that wishes it were with Ryan Gosling. Sorry, Michael -- The Notebook really ruined everyone else's chances with Rachel.

Do you think Rachel and Michael will have a baby together??

Photos Courtesy of: Fame/Flynet