Britney who? 'N Sync's Justin Timberlake hasn't been wanting for female companionship since his breakup with Britney Spears. After briefly being linked to Janet Jackson, 36, in July, Timberlake has been spotted out and about with dancer Jenna Dewan, 21. On Aug. 22 Dewan came to visit him on the L.A. set of his video shoot for "Like I Love You," the first single from his solo debut. Ken Sunshine, Timberlake's publicist, claims the two are just "longtime friends." That could be true: According to a source close to the shoot, two days after Dewan's visit Alyssa Milano, 29, arrived on the set and spent much of the day hanging out in Timberlake's trailer. An 'N Sync insider says that something is definitely brewing between the former Charmed actress and the pop star. Milano's rep had no comment. When asked about Timberlake and the actress, Sunshine said, "He's 21 years old, God bless him."