United Kingdom, Feb. 5 -- Justin Bieber didn't tell bosses at the Grammy Awards he planned to perform in his underpants.

The 31-year-old pop star was among the performers at the glitzy prizegiving in Los Angeles on Sunday night (01.02.26) and he stunned the audience at the Crypto.com Arena by walking out on stage wearing nothing but a pair of satin boxer shorts made by his fashion brand SKYLRK and a pair of socks.

Bieber's fashion choice also surprised organisers because the singer didn't tell anyone about his plan. During an appearance on the Rolling Stone Music Now podcast, Grammy Awards executive producer Ben Winston said: "I don't think he decided what the outfit would be until he walked on stage.

"He's not even really going: 'This...