A source tells ET that the couple grew even closer in quarantine.
The teen considers Swift her songwriting idol.
The two singers made an appearance at the awards show in London on Tuesday.
Swift, who became the first female artist and the first non-English artist to receive the award, was introduced by Selena Gomez.
The mother-daughter duo have performed together in the past.
The winners will be announced during a live ceremony airing Sunday, May 23 at 8 p.m. ET / 5 p.m. PT on NBC.
The actor first went by the pseudonym William Bowery on the tracks he contributed to.
'She was playing way past where she was,' Urban told ET of Swift.
ET chats with Keith Urban and Mickey Guyton about co-hosting the 2021 ACM Awards, airing April 18 on CBS and Paramount+.
The singer praised a Georgia-based flight nurse for 'being brave enough to put yourself in danger to help others.'
The 31-year-old singer gave a clue-heavy interview on 'The Late Show With Stephen Colbert.'
The 'Late Show' host welcomed the songstress and tried to get the bottom of her inspiration for the tune.
On ET's The Download: the world mourns the loss of England’s Prince Philip and legendary rapper, DMX, who both died on Friday.
Check out some of ET's top new music picks of the week!
