Ringing in her 40th year this past weekend, the always stunning Reese Witherspoon celebrated a milestone birthday with one heck of a party—cue the FOMO. In addition to a killer guest list (Kate Hudson, Jennifer Aniston and Nicole Kidman were a few attendees) and a private Taylor Swift concert (casual), the party included the birthday girl’s too-cute rendition of “Sweet Home Alabama” with a little help from country star Keith Urban. Here, watch the blonde beauty rock out to her signature tune and dance the night away to Tay’s “Shake It Off”—plus a few insider snaps from the party to elicit all the jealousy feels.