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marked another milestone Sunday on her path to motherhood: Her baby shower.
About 90 people attended the Beverly Hills shower, organized by celebrity party planner Mindy Weiss, hosted by Richie's mother Brenda, and thrown by her sister Sophia and friends Paris Hilton and Masha Gordon.
And while Richie has not revealed whether she's having a boy or a girl, some of the gifts offered a clue.
From NoMi boutique in L.A., guests picked up a pair of $50 baby sneakers for a boy, and a $50 Tummy T Jack maternity shirt with a picture of a boy on the front.
Invitations were being hand-delivered Thursday to the event, whose theme was The Wizard of Oz,
Richie and boyfriend Joel Madden announced the pregnancy in July
. She is due in January.
"They're so excited," says a friend. "They can't wait to meet their little baby."
Madden recently told PEOPLE
that the impending arrival is "the most exciting thing that's ever happened to me, and to us."