A post shared by Lance Bass (@lancebass) on

The Backstreet Boys practically serenaded 'NSYNC’s Lance Bass on stage at their show at Planet Hollywood in Las Vegas on Saturday night.

They sang, “Shape of My Heart" while they all exchanged high-fives and hugs.

The Backstreet Boys posted a video with the caption, “We really showed @lancebass the shape of our hearts tonight. Thanks for coming by #BSBVegas, brother!" Lance also posted a photo on Instagram of the Backstreet Boys performing.