Before: Ashlee Simpson-Wentz
Ashlee Simpson-Wentz debuted her chestnut highlighted strands at the BCBG Max Azria Spring 2011 Show in September 2010.
After: Ashlee Simpson-Wentz
Just a few months before announcing her split to hubby Pete Wentz, Ashlee Simpson-Wentz cropped her hair into a pixie cut and bleached it blonde.
Always edgy, Rihanna was known for her trendy black bob when she was dating Chris Brown.
These days, Rihanna is red-hot (literally!). She's gone firetruck red with Rapunzel-length strands. P.S. - check out that moon mani!
Before: Jessica Biel
Jessica Biel was in love and sporting light honey-colored locks here at a 2007 premiere for I Now Pronounce You Chuck and Larry in the early days of her and Justin Timberlake's relationship.
After: Jessica Biel
Perhaps the new hue was reflecting the dark times ahead. Jessica Biel and Justin Timberlake ended things just five months after this somber color change.
Before: Olivia Wilde
Always a red carpet success, Olivia Wilde made it a point to look glamorous and polished while she was married to Italian Prince Tao Ruspoli.
After: Olivia Wilde
Throwing her staple strands out the door, Olivia Wilde added some edgy fringe just in time for the 2011 Golden Globes and her split from her husband in February.
Before: Scarlett Johansson
ScarJo rocked some serious bombshell hair at the 2010 MTV Movie Awards. Ryan Reynolds might have been named "Sexiest Man Alive," but this look screamed, "I know, Ryan Reynolds is one lucky guy."
After: Scarlett Johansson
After a huge Golden Globes fail, ScarJo made her mark once again on the red carpet at the 2011 Oscars, creating a lot of buzz around her hair and love life.
Before: Carey Mulligan
She was considered Queen of the Pixies when Shia LaBeouf was her main squeeze, here at the 2010 Oscars.
After: Carey Mulligan
Since splitting in October 2010, Carey Mulligan has been trying to grow some longer locks.
Before: Sandra Bullock
Always one for a center part, Sandra Bullock kept her look fresh and young at the 2010 MTV Movie Awards.
After: Sandra Bullock
It took a little while, but eventually Sandra Bullock traded in her old style for some new bangs and a deeper hue to walk down the red carpet with instead of ex-husband Jesse James.
Before: Rumer Willis
Looks like Rumer Willis's model boyfriend Micah Alberti taught her how to pose donning a fishtail brad and reddish tint here at the 2009 Teen Choice Awards.
After: Rumer Willis
Since their split in October 2010, Rumer Willis's hair keeps getting shorter, brighter, and more wild.
After an altercation with a backup dancer while on tour with the Jonas Brothers, Lovato entered rehab for "physical and emotional issues" in November 2010. Released in January 2011, Lovato told Seventeen, "I basically had a nervous breakdown." After addressing lifelong issues with eating disorders, Lovato is now a spokesperson for the Jed Foundations Love is Louder Than the Pressure to Be Perfect campaign.
After: Demi Lovato
After a stint in rehab for emotional issues, Demi Lovato resurfaced single and with this chocolate color in 2011.
Before: Kelly Osbourne
The couple that gets their hair cut together, stays together? Kelly Osbourne and her boyfriend Luke Worrall wore almost identical hairstyles in 2009.
After: Kelly Osbourne
From a woman scorned to a fashion expert, the newly dubbed Fashion Police commentator looks gorgeous with shoulder-length strands post breakup.
Before: Halle Berry
When Halle Berry started dating Gabriel Aubry she had bombshell shiny curls, here at the 2008 Annual ELLE Women in Hollywood event.
After: Halle Berry
It seems like Halle Berry's hair got shorter with her patience by the end of her four year relationship, as she now sticks to this sexy pixie.
Before: Rachel Bilson
While Rachel Bilson and Hayden Christensen were quite the buzz, her hair was rather blah in 2009 at an anniversary party for 3.1 Phillip Lim.