The singer and his wife, Rochelle, are already parents to a 3-year-old daughter, Ava, and McLean told ET that his little girl is “ecstatic” to be a big sister.
“She has her own little baby that she's been tucking under her shirt like she's pregnant!” he gushed. “She's like, swaddling her babies now… She loves it, she's so sweet and she's just an awesome kid.”
McLean also teased the 2017 residency shows, revealing that the performances will feature a little something for all Backstreet fans.
“If you've ever been to our Millennium concert or the Black and Blue concert, put those two concerts together and multiply it by 100,” McLean explained. “Add a little bit of glitz, and a little bit of glamour -- that'll be Vegas.”
Check out the singer’s mixed feelings about his kids listening to his music in the video below.