The 21-year-old singer debuted a floppy blond hairstyle at the event, where he performed and got emotional onstage. Many people took to Twitter to post side-by-side pics of Bieber and Gosselin, circa 2009, when she and then-husband Jon Gosselin starred with their sextuplets and twins, now ages 14 and 11, on the TLC reality show Jon & Kate Plus 8.
Will Wade Jr./PacificCoastNews
Kate, 40, who has sported long hair over the past few years, retweeted several posts.
"Haha!" she said on Twitter. "My timeline is blowing up over this!!!!"
One user asked Kate if her twins Cara and Maddie find the comparison "really cool" or "SO embarrassing."
"Really really cool!" Kate replied.