Not spotted at the bash were Jessica Simpson, her daughter Maxwell and fiance Eric Johnson.
Plus Simpson's boyfriend, "Boardwalk Empire" star Vincent Piazza, was nowhere to be found.
By Radar Staff Pete Wentz and girlfriend Meagan Camper put on a united front when they stepped out in Hollywood on January 21 with his three-year-old son, Bronx, but Star magazine can exclusively reveal that there is sadness in paradise.
Privately, the pair were hit hard when Meagan suffered a miscarriage around Christmas, her grandmother Sherrilyn Camper exclusively tells Star.
In June of 2013, when Wentz turned 34, the three took a vacation to Miami together.
Madden is said to have also been relying on sister-in-law Cameron Diaz, who's married to his brother Benji, for help."Joel is determined to fight for Nicole.The Fall Out Boy rocker opened up about the end of their marriage on Howard Stern's Sirius XM radio show on Tuesday. "But if you don't know how to have those arguments, then they become nuclear," he continued."Did you think you would be married forever or did you know it was going south? "And we were doing this all in the public eye, which as you know, it doesn't help, because you have people scrutinizing everything you do: 'He cut his hair—it's breakup hair! It's a haircut.'" Even though Wentz and Simpson went their separate ways, they have a 50/50 custody agreement. We've actually figured out how to parent that way in a really good, healthy way. The exes, who finalized their divorce a year ago, reunited yesterday (Nov. Alongside Wentz, 33, and his 24-year-old model girlfriend Meagan Camper, Simpson, 28, helped set up the superhero-themed party at The Coop in Studio City, Calif.The trio "were at ease in each other's company," according to the Daily Mail and seemed to be having a great time as they welcomed party guests, including Nicole Richie and her daughter Harlow and Simpson's parents, Tina and Joe, who arrived separately after announcing their divorce.