The 21-year-old singer is set to hook up with Britney for the European leg of her tour, which starts in October, where he will promote his debut solo album Fastlife.
'It's a dream come true,' he told People magazine about being asked to open the Femme Fatale shows.
'She was the first girl I ever had a poster on my wall of, and her album was the first CD I ever bought. It's so funny to think I had that on my wall and here I am about to perform with her.
'She's a very sweet lady.'
'I'm really looking forward to being part of this,' he continued.
'I'll be playing more music than I have the past few times I've performed live so far,' he adds. 'It's going to be really fun to perform some of my music from the album.'