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Gwyneth Paltrow, Lena Dunham Throw Celebrity Trainer Pal Tracy Anderson a 40th Birthday Party — Get All the Inside Details

Tiny firecracker! Gwyneth Paltrow and Lena Dunham joined together on Wednesday, March 11, to celebrate their trainer and BFF Tracy Anderson’s 40th birthday. The fete was held at Soho House in West Hollywood, Calif., and couldn’t have been better suited for the fitness guru, who is the woman behind some of Hollywood’s most famous, sexiest bods.

Related: PHOTOS: Gwyneth's BFFs

Dunham, who recently started working out with Anderson, hosted the bash along with Girls executive producer Jenni Konner, a source reveals exclusively to Us Weekly. Along with Paltrow and 50 other guests, Dunham had a private room filled with oversized balloons and a dessert table covered with gluten-free cakes and snacks, including personalized emoji cookies featuring Anderson’s face.

The actresses and guests sipped on speciality birthday cocktails including creations like the “Tiny Firecracker” and “Scientist in a Bikini” in Anderson’s honor, as well as Goop-approved organic wines.

Related: PHOTOS: Celebs favorite workouts

“Lena and Jenni toasted Tracy with speeches and a gift that brought Tracy to tears,” the insider tells Us. “Tracy then took the mic to celebrate what Lena and Jenni's friendship means to her, and what remarkable role models they both are.”

“Leave it to the GIRLS that bring us the best of Sunday night @GIRLSHBO to give this girl the best most heart full birthday party ever! Ummmm it was a blast! @campsucks @lenadunham keep making creative babies because if the word gets out what kind of kick ass party planners you are there just might be a GIRLS on ice, GIRLS open mic, GIRLS Glee oh now we are on to something!!!!” Anderson also gushed alongside a snap of the trio on Instagram.

Paltrow, for her part, recently gave Anderson (who is her business partner) a shout-out on Instagram, letting fans know they can get the body of their dreams by subscribing to Anderson’s newly launched real-time workout video stream. “#40isthenew20,” the Iron Man actress wrote on a video of Anderson working out. 

get a killer @tracyandersonmethod bod for $3.10 per day, 5 days a week with #TArealtime #40isthenew20. all the streaming details on (tracyanderson.com)

A video posted by Gwyneth Paltrow (@gwynethpaltrow) on Feb 2, 2015 at 3:02pm PST

Dunham, who’s known for embracing her curves, recently admitted she’s started working out with Anderson. During an interview with Ellen DeGeneres, the Girls creator admitted: “I am the physically laziest person you've ever met. I never even crawled. I just laid down on my back until I was 5, then started walking, sort of. Tracy Anderson, who is a friend of mine and a professional fitness trainer, is trying to get my 98-year-old body to match its chronological age of 28.”

Related: PHOTOS: Diet secrets of the stars

According to another source, it’s working. “Lena loves the workout – she says it’s the only workout she’s ever really enjoyed.”

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