Celebrating his 28th birthday in West Hollywood, Adam Lambert was spotted at the Grammy Style Studio Day 3 on Friday (January 29).

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Adam Lambert: Grammy Lounge Birthday Boy

This time of year always draws the celebrities out and Christina Aguilera was spotted heading into a Grammy pre-party in Los Angeles on Friday night (January 29).

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Christina Aguilera: Pre-Grammy Partier

Enjoying a night out together, Katy Perry and Russell Brand were spotted at a pre-Grammy party in Los Angeles on Friday night (January 29). The newly engaged couple did their best to quickly shuffle past the on-hand paparazzi and head inside to the Wonderland nightclub.

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Katy Perry and Russell Brand: Wonderland Wonderful

Fitting in a little time for herself, Cameron Diaz was spotted shopping at Barney’s New York in Beverly Hills on Friday (January 29). Dressed casually in a white t-shirt overtop a black bra, the “Vanilla Sky” actress meandered around the store for quite some time and eventually left with a big bag full of goodies.

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Cameron Diaz: Barneys Babe

Adding to the giant list of celebrities in attendance at this year’s Sundance Film Festival, Chace Crawford and Emma Roberts attended the premiere of “Twelve” on Friday night (January 29). The “Gossip Girl” hunk and the “Hotel For Dogs” beauty were spotted posing for pictures with “Twelve” director along with rapper 50 Cent before all heading inside for the film’s debut.

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Chace Crawford and Emma Roberts Premiere “Twelve”

Gearing up for up for one of the biggest award shows in Hollywood, Rihanna was spotted at rehearsals for the Grammy’s last night (January 29). Looking to be having a marvelous time, the “Umbrella” songstress happily posed for pictures while receiving a kiss from young sensation, Justin Bieber – who has admitted to having a crush on the 21-year-old star.

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Rihanna and Justin Bieber: Grammy Gift Loungers

Having just flown into town the previous evening, Britney Spears was hard at work in Miami, Florida on Friday afternoon (January 29). Wearing a pretty pink sweater while joined by her trusty security staffer, the “Womanizer” singer made her way to a recording studio to work on new material

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Britney Spears Hits the Studio in Miami

Gearing up for a fun-filled weekend, Kristin Cavallari was spotted making her way around Beverly Hills, California on Friday afternoon (January 29). The “Hills” hottie made a quick pit stop to grab up some beverages before bringing her iced coffee drinks over to a friends house.

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Kristin Cavallari: Twitter Overload

Prepping for the weekend with a retail outing, Vanessa Hudgens was spotted making her way along Melrose Avenue in West Hollywood on Friday (January 29). Looking ever-so-adorable, the “Sucker Punch” sweetheart hit up the Diesel store for a few items before offering up a smile for the paparazzi while carrying her bag to the car.

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Vanessa Hudgens: Diesel Darling

Prepping for the weekend with a retail outing, Vanessa Hudgens was spotted making her way along Melrose Avenue in West Hollywood on Friday (January 29). Looking ever-so-adorable, the “Sucker Punch” sweetheart hit up the Diesel store for a few items before offering up a smile for the paparazzi while carrying her bag to the car.

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Vanessa Hudgens: Diesel Darling