Celeb Spotter 039: Jessica Alba, Lady Gaga and Mariah Carey

Another big week for celebrity style!

Jessica Alba stepped out for multiple events in New York City this week in a pair of chic looks that flaunted her growing baby bump (it's a boy!), while stars like Lady Gaga, Jessica Alba and Justin Timberlake attended the first couple of World Series games in Los Angeles.

SEE ALSO: Jenna Dewan Tatum strips down to her lingerie: See the racy pic

V Magazine threw a star-studded party honoring Karl Lagerfeld that attracted big names like Mariah Carey, Gigi and Bella Hadid, Joan Smalls and Kris Jenner, some of whom were also seen out and about in the following days rocking some memorable street style looks, too.

More of our favorite sightings of the week came from Paris Hilton, David Beckham and Anna Faris.

See the best celebrity sightings of the week below:

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Celeb Spotter 039: Jessica Alba, Lady Gaga and Mariah Carey
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Celeb Spotter 039: Jessica Alba, Lady Gaga and Mariah Carey
Jessica Alba put her growing baby bump on firm display in a skintight black dress in SoHo. (Photo by Raymond Hall/GC Images)
Martha Stewart looked chic as ever in glittering brown pants and a matching fur scarf. (Photo by Nancy Rivera/Bauer-Griffin/GC Images)
Lady Gaga channeled Marilyn Monroe at the first World Series game in a white leotard and black booty shorts. (Photo by Pressphotobank/Bauer-Griffin/GC Images)
Paris Hilton was pretty in black at an event in Los Angeles. (Photo by GP/Star Max/GC Images)
Gigi and Bella Hadid walked hand-in-hand as they headed to a V Magazine party. (Photo by JNI/Star Max/GC Images)
Justin Timberlake went to game two of the World Series in Los Angeles. (Photo by BG007/Bauer-Griffin/GC Images)
Zachary Quinto and his guy Miles McMillan looked casual but chic at New York Magazine's 50th Anniversary Celebration at Katz's Delicatessen.
David Beckham and his son, Romeo, sat courtside at a Lakers game together. (Photo by Allen Berezovsky/Getty Images)
Lindsay Shookus was spotted going house hunting with boyfriend Ben Affleck this week while wearing a totally see-through top. (Photo by BG004/Bauer-Griffin/GC Images)
Bella Hadid attempted to avoid paparazzi while wearing a bright red-white-and-blue tracksuit. (Photo by Raymond Hall/GC Images)
Mariah Carey stunned after performing at a V Magazine party honoring Karl Lagerfeld. (Photo by Gotham/GC Images)
Sharon Stone looked cool as ever in a black dress and blue velvet platforms. (Photo by BG022/Bauer-Griffin/GC Images)

Lily-Rose Depp stepped out for the 2017 WWD Honors at The Pierre Hotel in NYC.

(Photo by Jamie McCarthy/Getty Images)

Yolanda Hadid was chic in all black while running errands in TriBeCa. (Photo by Gotham/GC Images)

CoolSculpting by Allergan brand ambassador Debra Messing stepped out for the brand's Break The Ice panel at Minus5 Ice Bar in NYC.

(Credit: Getty Images for CoolSculpting)

Kendall Jenner rocked an oversized green sweatshirt while out and about in NYC. (Photo by Gotham/GC Images)
All buttoned-up! Nicole Kidman stepped out for a promo stop in NYC. (Photo by Patricia Schlein/Star Max/GC Images)
Don Lemon ditched his typical suit jacket for a dressed-down look at New York Magazine's 50th Anniversary Celebration at Katz's Delicatessen.
Justin Theroux was seen out in NoHo this week. (Photo by UMV/Star Max/GC Images)
Jessica Alba looked incredible in a blue-and-white ensemble that showed off her baby bump. (Photo by Raymond Hall/GC Images)

Former "Biggest Loser" star Jillian Michaels was spotted on set of her recent SodaStream shoot.

(Credit: SodaStream)

Rita Ora looked chic in black-and-white while out in London. (Photo by Neil Mockford/GC Images)
Kris Jenner smirked for the paparazzi in New York City. (Photo by Gotham/GC Images)

Actress Ashley Greene delivered funds and supplies to the Santa Rosa Community Health Center, which lost its main facility in the Northern California fires, on behalf of the California Fire Fund.

(Credit: Rhiannon Ellis)

Lori Loughlin kept it casual while out and about in LA. (Photo by SMXRF/Star Max/GC Images)
Pretty in pink! Model Joan Smalls looked gorgeous at a V Magazine party. (Photo by Nancy Rivera/Bauer-Griffin/GC Images)
Niall Horan waved to the paparazzi before performing on "Jimmy Kimmel Live!" (Photo by RB/Bauer-Griffin/GC Images)
Anna Faris was stunning in a yellow dress during a promo stop in New York City. (Photo by Patricia Schlein/Star Max/GC Images)
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