Are X-Factor judges Demi Lovato and Britney Spears giving each other style tips?

Britney Spears changed up her hairstyle last week and is now rocking pink and blue extensions. The 30-year-old singer showed off her new 'do on stage at the iHeartRadio Music Festival in Las Vegas on Sept. 21.

PHOTOS: Britney's sexiest tour costumes

Lovato, 20, who previously styled blue and pink hair streaks on separate occasions over the summer during X-Factor's nationwide talent auditions.

"I love changing my hair a lot -- I think it's fun," Lovato told in an August 2012 interview. "I used to always want to dye my hair blue and purple and pink when I was younger. But I was busy trying to make it in the industry as an actress, and it was hard to go in for auditions with blue hair. And so when I heard of the dip-dye trend, I loved it, and I felt like I could finally dye my hair blue. You know you've made it when you can dye your hair blue."

VIDEO: Demi's hair color evolution

But the "Skyscraper" singer has changed up her style once again. Lovato tweeted a photo of her very blonde hair and wrote, "Guess what's back, back, back, back again . . . Bangs are back, back, back tell your friends."

PHOTOS: Demi through the years

Tell Us: Did Britney Spears or Demi Lovato rock the blue hair streaks trend better?

This article originally appeared on Who Rocked Blue Hair Streaks Better: Britney Spears or Demi Lovato?