This Week in Celebrity Twitpics (PHOTOS)

JLO's advice for Britney
The former judge gives advice to newbies Britney and Mariah.
In this week’s roundup of Twitpics, celebrities have been spending some quality time with family and friends while soaking up the last bits of summer.

Justin Bieber recently tweeted a shirtless photo of himself from bed that is sure to make any “Belieber” swoon, and Britney Spears shows off her bikini body while spending some days in the sun.

Which hip-hop singer dyed his hair, and who crashed a J-Lo concert?

Chris Brown is looking a little blue these days. The singer recently posted a photo on his Instagram account with dyed blond and blue hair. However, the post was quickly taken down hours later. Does he regret his “smurf” style hairdo?

Olympic swimmer and hottie Ryan Lochte showed some school spirit and tweeted a photo wearing a University of Florida gator t-shirt to support College Colors Day earlier this week. Lochte attended the Florida school and graduated in 2007 with a degree in sports management.

Ryan Seacrest traveled to Atlanta this week to crash his American Idol co-host Jennifer Lopez concert and tweeted a photo with her tour partner Enrique Iglesias.

Wonder if Ryan brought his dancer girlfriend, Julianne Hough along for the show?

To see what more of your favorite celebs were up to this week, check out the gallery for more photos.