The actress, who has just left Desperate Housewives, was accompanied on her beach trip by a man believed to be her new companion – wealthy businessman Steve Pate.
Although there's been no confirmation on the nature of the couple's relationship yet, Nicollette – who split with her fiancé Michael Bolton in 2008 – has been spotted on outings with her dark-haired beau since April this year.
"(They) are really happy together. He's really sweet to her," a pal told the US press.
And Nicollette wasn't the only actress soaking up the rays in Malibu over the weekend. Sin City beauty Jessica Alba went for a dip with her husband Cash Warren.
The 28-year-old star is on top form, just over a year after welcoming her first child, daughter Honor Marie.