ET spoke with the 'Avengers' superfan on the red carpet at the 'Avengers: Endgame' premiere in Los Angeles.
The boy band was formed on April 20, 1993.
The boy band also had a special Q&A at the Grammy Museum in Los Angeles on Monday.
The singer also shared why he broke down in tears while performing one of his new tracks at a party he hosted in Las Vegas on Friday.
ET spoke with McLean on the red carpet at the 2019 ACM Awards in Las Vegas on Sunday.
The Backstreet Boy opened up about his hurdle-filled road to adulthood and how becoming a father made him finally "grow up."
ET was on set for an exclusive sneak peek at the Backstreet Boy's wedding in his new 'Boy and a Man' video.
AJ McLean ties the knot with his real-life wife, Rochelle, again in the emotional new video for his new single, 'Boy and a Man.'
ET talked to the group about the new 'Boy Band Con' documentary, which centers on their early manager, late mogul Lou Pearlman.
While 'Property Brothers' star, Drew Scott, was hoping his wife would be serenaded, McLean couldn't resist choosing his cute daughters!
Twain couldn't hide her excitement as she was pulled on stage by McLean at the Backstreet Boys' 'Larger Than Life' residency show.
The boy band and rapper collaborated for a fun new Super Bowl commercial.
The boy band also shares their first impressions of one another.
The 'Night Visions' singer explained to fans why his social media team will be handling more of his posts going forward.
