Rachel McAdams  made her Met Gala debut on Monday night at the Metropolitan Museum of Art in NYC. The actress wore a pale pink Ralph Lauren  Collection silk evening dress with a chiffon train, looking gorgeous as she strutted down the red carpet at the Anna Wintour Costume Center. Though Rachel displayed major PDA with her new boyfriend , Patrick Sambrook, in Toronto last week, she walked solo on the carpet. This year's gala celebrates American-based designer Charles James . He was best known in the '40s and '50s for glamorous ball gowns that highlighted a woman's curves. Don't forget to check out the all-time best dressed guests from the Met Gala !