Rachel McAdams is opening up about her new experience as a working mom.ET's Kevin Frazier spoke to the 41-year-old actress about her new film,, which she stars in opposite Will Ferrell. Ferrell and McAdams play Icelandic singers in the comedy, who are given a chance to represent their country at the Eurovision Song Contest.McAdams talked to ET about shooting the film in Iceland and Scotland, and about actually getting to bring her young son along.