Taylor Swift Celebrates Joe Alwyn's 'The Favourite' Winning 7 BAFTA Awards

Kevin Mazur/Getty Images for InStyle
Taylor Swift attends the 2019 InStyle and Warner Bros. 76th Annual Golden Globe Awards Post-Party at The Beverly Hilton Hotel on Jan. 6, 2019 in Beverly Hills, Calif. 

Taylor Swift was not at this year's Grammys, but she was on hand for another awards ceremony Sunday night (Feb. 10). The "Delicate" singer was apparently in London with boyfriend Joe Alwyn, celebrating the success of the actor's film The Favourite at the 2019 BAFTA Awards.

"AHHHHH @thefavouritemovie just won 7 @bafta awards !!!" Swift wrote on Instagram. "Bout to go give some high fives - thanks @stellamccartney for this dressss."

The Favourite took home the most honors of the night: outstanding British film, best original screenplay, best actress (Olivia Colman), best supporting actress (Rachel Weisz), best production design, best costume design and best makeup and hair. Alwyn plays the supporting role of Samuel Masham in the film.

Proud girlfriend Swift didn't walk the red carpet, but she was spotted with Alwyn at an after party -- in style, wearing a flowing Stella McCartney gown with her hair gathered in a romantic, wavy updo.

See Swift in her gorgeous gown below.