Video clips posted to Instagram show Swift and Hiddleston showing off their dance moves at after-party.
Swift swayed to Crazy In Love and Bring 'Em Out along with Marvel Cinematic Universe actor Tom Hiddleston.
Rumours about the Blank Space singer's role in the movie started in July 2015.
Idris Elba, Anna Wintour, Jonathan Ive and Swift will co-chair the annual fashion fundraiser.
The music producer recently unveiled his latest work with Rihanna, called This Is What You Came For.
The app developed by former Twitter executive, makes your texts public.
Award ceremony taking place at T-Mobile Arena in Las Vegas on 22 May.
The 60-second spot went online on 1 April, which also happens to be Apple's 40th anniversary.
The couple got married on March 2011.
Moretz shares that she would want to follow in the footsteps of Sandra Bullock of Julia Roberts.
The couple celebrated their first anniversary together on 6 March.
The singer performed a duet with Keith Urban at Reese Witherspoon's 40th birthday party in Hollywood.
The singer also shared a video of her dancing to the music played by Harris.
The two were spotted together following rapper Future's concert in Los Angeles.
The British singer was romantically linked to Swift, 26, in November 2014.
American singer and Scottish DJ Calvin Harris are likely to get married in Hawaii in August 2016.
Gomez is rumoured to be dating her best friend Taylor Swift's brother Austin.
The couple set off for a tropical beach holiday following their one-year anniversary together.
Swift's Bad Blood video watched by more than 18m in the US in May 2015.
Jackson estate earnings zoom past record $1b in 2015
In one photo the singer in wavy blonde hair is seen rocking a yellow T-shirt.
Harris, however, does not want to collaborate with his girlfriend on any tracks.