The reality star, 30, had her dark hair lightened by several shades and she showed off the new look earlier this week as she left a television taping in Studio City, California.
'I dyed my hair lighter for summer,' the Keeping Up With the Kardashians star tweeted.
Lightening up: Kim Kardashian showed off much lighter hair this week compared to the darker shade of her tresses back in May
She was on her way to watch an episode of So You Think You Can Dance with her friend, Pussycat Dolls founder Robin Anton.
Carry on: Kim grinned after managing to steady herself
Getting tips for the first dance? Kim watched a live taping of So You Think You Can Dance
The bride-to-be was also spotted carrying an Alexander McQueen garment bag into an office building in West Hollywood, California.
The reality star has just returned from spending Fourth of July weekend in Minnesota with her fiancé, Kris Humphries' family and began her day by hitting the gym.
Out and about: Kim Kardashian was spotted running errands in West Hollywood Thursday
Kim has hired Jennifer Lopez's coach Gunnar Peterson and Tracy Anderson, who is famous for her work with Madonna and Gwyneth Paltrow, to whip her into shape.
Anderson, who sometimes trains her client twice in one day, tells Life&Style magazine: 'We don’t want to take away Kim’s amazing curves, so we just do specific movements to tighten the skin and to pull the muscles tight against the bone.'
Giving back: The reality star returned an Alexander McQueen dress to the offices
On top of that, Kim still plans to continue sessions at Barry’s Bootcamp, a high-intensity interval training class.
The wedding is rumoured to be being filmed for an E! Wedding Special just like her sister Khloe's wedding was.
Kim recently told Cosmopolitan magazine that she has no issue with her life being played out in public.
'I've been so lucky to have the shows on E,' she says.
'They are a great commercial and have allowed me to do more than I could have even dreamed.'
'Yes, my life is very public, and I'm opened up to a ton of scrutiny. But my personal life is my career and I like that.'
Still, even Kardashian admits she can find the public a little intrusive. She says: 'Sometimes I feel like a zoo animal.'
'I'll be at a restaurant and someone will put their phone in front of my face and take a picture without even saying hi.'