Mark Zuckerberg and Priscilla Chan have been together since college in the early 2000s. A lot has changed since then, including their style.

Priscilla, dressed in a black gown and silky-beige shawl, was seen hysterically laughing at her husband’s antics. Guests, including women in gowns and men in tuxedos, clapped and cheered as Zuckerberg belted out his performance with the help of a live band.