Chrissy Teigen, 35, joined the star-studded lineup of guests at former POTUS Barack Obama‘s 60th birthday party on August 7. She and John Legend, 42, flew into Martha’s Vineyard for the high-profile bash, and were all smiles in a series of pics and videos from the event. Chrissy even took to Instagram to share a video of herself singing a Marilyn Monroe-inspired rendition of “Happy Birthday.” In the clip, she wore a white gown with a peplum hemline and high slit.