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Simon Cowell, Lauren Silverman

XPOSUREPHOTOS.COM

Simon Cowell certainly caused a stir this week.

The X Factor judge made headlines after it was announced he's expecting his first child with a woman who's technically still married to his friend.

He wasn't the only celeb that topped our headlines, though.

Check out Kim Kardashian's trespassing-paparazzo incident, Christina Aguilera's slimmed-down bod, and more!

Kim Kardashian's Trespassing Paparazzo: After new mom Kim Kardashian caught a photographer trespassing on Bruce and Kris Jenners private property Monday, she shot a video with her phone and posted it on Keek. The clip also captured Kris chasing the shutterbug off of the grounds.

Selena Gomez's 21st Birthday Celebration: Selena Gomez celebrated her 21st birthday with a big gypsy-themed bash last weekend, with the likes of pals Julianne Hough, Nina Dobrev and her ex Justin Bieber showing up to help her ring it in.

Selena Gomez

Michael Simon/startraksphoto.com

Simon Cowell Expecting a Baby: The X Factor judge made waves this week when it was announced that he was expecting a baby with New York City socialite Lauren Silverman, who is technically still married to real estate mogul Andrew Silverman

Christina Aguilera's Slimmed-Down Figure: The returning Voice coach showed off her hot bod at a NBC press event in Beverly Hills this week, striking a pose in a body-hugging pink dress.

Lea Michele Breaks Her Silence: Following the death of her boyfriend Cory Monteith July 13, the Glee star spoke out for the first time via Twitter, writing, "Thank you all for helping me through this time with your enormous love & support. Cory will forever be in my heart."