Miley's bash was always going to be wild but who knew it would spark a new celeb bromance. Calvin tweeted:
The One Direction boys celebrated their American Music Awards win at Miley's party at Beacher’s Madhouse, in LA, according to The Sun.
And Miley wasn't just celebrating her 21st, she was also in high spirits after performing in a skimpy two-piece adorned with cats' heads while she sang in front of a giant ginger puss at the AMAs.
Belting out her huge ballad 'Wrecking Ball', Miley won applause for her powerful vocals.