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Pete Wentz holds hands with his son Bronx as they take their pup to Petco for a grooming on Saturday (October 6) in Studio City, Calif.

The 33-year-old rocker and his little guy were joined by girlfriend Meagan Camper, who held onto the adorable pup after his appointment.

PHOTOS: Check out the latest pics of celebrity babies

Last month, Pete and his ex-wife (and Bronx‘s mom) Ashlee Simpson took their son to get a haircut together.

10+ pictures inside of Pete Wentz taking Bronx to Petco with their little pup… More Here! »

Ashlee Simpson and her ex-husband Pete Wentz reunite to bring their son Bronx for a haircut at the Little Rockstar Hair Salon on Thursday (September 13) in Sherman Oaks, Calif.

The 27-year-old entertainer carried her 3-year-old son out of the salon after his haircut.

PHOTOS: Check out the latest pics of Ashlee Simpson

In case you missed it, check out Ashlee‘s sister Jessica Simpson‘s recently released commercial for Weight Watchers, which premiered during her appearance on Katie.

25+ pictures inside of Ashlee Simpson and Pete Wentz at the hair salon with Bronx… More Here! »

Ashlee Simpson and a pregnant Kelly MacDonald hit the red carpet at the season three premiere of Boardwalk Empire held at the Ziegfeld Theater on Wednesday (September 5) in New York City.

The 36-year-old Scottish star of the show was joined by her co-stars Jack Huston, Michael Shannon, Vincent Piazza (Ashlee‘s beau), Gretchen Mol, Steve Buscemi, and Bobby Cannavale!

Also at the event was Stanley Tucci with his new wife Felicity Blunt.

Boardwalk Empire season three premieres on September 16 on HBO!

Also pictured inside: Ashlee and her son Bronx hanging around in NYC earlier this week.

FYI: Kelly is wearing a Pea in the Pod black lace insert dress, Edmundo Castillo shoes, David Yurman jewelry and a Kara Ross bag. Gretchen is wearing Pomellato jewels. Vincent is wearing a Billy Reid suit and shirt.

15+ pictures inside of the Boardwalk Empire cast at the season three premiere… More Here! »

Pete Wentz carries his adorable pint size son Bronx as they head back to their car on Sunday (August 26) in Malibu, Calif.

The 33-year-old musician and his 3-year-old son were joined by Pete‘s girlfriend Meagan Camper.

The trio stopped by a CVS Pharmacy where Bronx got a new Iron Man toy. Looks like Bronx likes his Marvel superheroes, he’s even wearing a Spider-Man shirt!

Earlier in the day, they went to the Malibu Country Mart where they dined on some delicious food.

FYI: Bronx is wearing a Junk Food Gap Kids Tee.

10+ pictures inside of Pete Wentz, Bronx, and Meagan Camper leaving the leaving CVS and Malibu Country Mart… More Here! »

Ashlee Simpson holds on tight to her adorable son Bronx as they make their way through LAX Airport on Friday (July 27) in Los Angeles.

At one point, the 27-year-old entertainer’s hat fell off and a kind stranger retrieved it for her.

PHOTOS: Check out the latest pics of Ashlee Simpson

Earlier in the week, the mother-son duo spent some time with Ash‘s beau Vincent Piazza while they were in NYC.

The happy trio was even spotted dancing together as they walked down the sidewalk.

10+ pictures inside of Ashlee Simpson and Bronx at LAX Airport… More Here! »

Ashlee Simpson and her beau Vincent Piazza hold onto little guy Bronx as the trio go for a stroll on Monday (July 23) in New York City.

The 27-year-old entertainer watched on as Vincent and Bronx, 3, danced with each other as they walked down the sidewalk. So cute!

PHOTOS: Check out the latest pics of Ashlee Simpson

Last week, Ashlee celebrated in style at the Samsung Galaxy S III event in New York City alongside Nick Millhiser and Alex Frankel of the band Holy Ghost!

Pete Wentz and his girlfriend Meagan Camper hold hands as they head to Marmalade for lunch on Tuesday (July 3) in West Hollywood, Calif.

The 33-year-old rocker and his gal were joined by their friends, Desperate Housewives actor Shawn Pyfrom and photographer Steven Taylor.

It looks like the foursome had some fun with the camera at lunch!

“Photoshoot fresh w/ @meaganjanedoe @petewentz & @steventaylor,” Shawn wrote on Twitter.

“Hipster cam by the great @shawnPyfrom #SolidGold And you like on twitter now,” Steven wrote the next day along with an Instagram pic.

10+ pictures inside of Pete Wentz and Meagan Camper out for lunch with pals… More Here! »