Bieber, 19, was photographed going back to his place after partying on his birthday earlier this month. Later, Wilde took to Twitter, and posted: "Bieber, put your f**king shirt on."
Alas, this did not go down too well with possessive fans, and Wilde had to face their wrath, reports dailystar.co.uk.
"You know, it's something I'd say to my little brother, and I probably have said it. You know, just, 'Put your shirt on. It's cold out there.' I meant it with all the love in the world.
"It's pretty much the funniest thing that's ever happened to me because my Twitter feed is now filled with the most hilarious abuse," Wilde said during a recent interview.