At the Academy Museum Of Motion Pictures' opening gala, Katy was photographed sharing a hug with Lady Gaga. Also in attendance: Nicole Kidman, Selma Blair, Halle Berry,Tiffany Haddish, Olivia Rodrigo, Jenna Dewan, Adriana Lima, Jurnee Smollett, Abigail Breslin, Kaia Gerber and Jacob Elordi, Eva Longoria, Anna Kendrick, Jennifer Hudson, Billie Lourd, Angela Bassett, Molly Shannon, Tessa Thompson, Jamie Lee Curtis, Lindsey Vonn, Sarah Paulson, Gabrielle Union and husband Dwyane Wade, Natasha Lyonne, Meg Ryan, Laura Dern, Issa Rae, Benedict Cumberbatch and wife Sophie Hunter, Regina King, Sophia Loren,Tom Hanks and wife Rita Wilson, Laverne Cox and Cher.

See Katy and other stars' epic hair transformations: