|Occupation||Barmaid at Upstairs|
|Portrayed by||Alyssa Milano|
|First Episode||Deja Vu, All Over Again|
|Last Episode||Buena Sera, Mr. Campbell|
|Romances||Kyle McBride, Craig Field, Billy Campbell|
Jennifer, who first appeared in the fifth season, is the younger sister of Michael Mancini. She was introduced as a playfully brash young woman who'd had an affair with the married Kyle McBride before they'd both moved to Los Angeles. She later became romantically involved with Craig Field, but was driven away from him after he'd become unfaithful. Jennifer's major romantic interest of the show became Billy Campbell, whose wife, Samantha, was having an affair of her own.
After Billy's marriage ended, he and Jennifer concluded the series happily by moving to Rome together.