So friends and former co-stars of the Buffy actress thought it was about time that Sarah celebrated her impending arrival in true tradition - with a baby shower.
Among the guests at the LA bash were actress Shannon Doherty, celebrity makeup artist Napoleon Perdis, who gave the ladies tips and makeovers at the party, and Hairspray director Adam Shankman – the officiator at the 2002 wedding of Sarah and Freddie.
The blossoming guest of honour – radiant in a cream maternity dress and, incredibly, a pair of Christian Louboutin heels – was also greeted by her close friend Michelle Trachtenberg.
The Gossip Girl actress, who starred as Sarah's younger sister in Buffy, recently revealed she was "jumping for joy" at the news her friend was expecting.
"We talk every other day. I'm super excited," the 23-year-old said. "I'm so happy for her and Freddie. She's going to be an extraordinary mum. Good people make great parents."
Thirty-two-year-old Sarah is expected to have her baby in the autumn, although she has chosen to remain tight-lipped over the exact date.
The actress met husband Freddie, 33, during the filming of I Know What You Did Last Summer in 1997 and they married in Mexico on September 1, five years later.
In 2007, Sarah legally changed her name to Sarah Michelle Prinze in honour of the couple's fifth wedding anniversary.