AceShowbiz -

Deemed as a "Gossip Girl" blockbuster event, the show's next week episode called "Dan de Fleurette" proudly presents two huge guest stars. Hilary Duff and Tyra Banks are coming to Upper East Side as two movie stars who are entangled in the group's lives.

A famous movie actress, Olivia Burke is enrolling at NYU in hope to lead a somewhat normal college experience. She ends up being Vanessa's roommate and will eventually get to know Dan who has no clue about her true identity. Duff is taking this recurring role. Meanwhile, Olivia's co-star in her movie is named Ursula and she is played by Banks. Serena gets the temp job at being Ursula's publicist.

Although boasting the guest stars, the episode airing October 5 will also focus on Jenny's first day of school at Constance Billard. The new day marks the time for the Humphrey to take her rightful place as the new Queen Bee after Blair leaves. Unfortunately for Jenny, Blair is more than happy to intervene when news reaches her that she may be needed back at Constance.

Meanwhile, Lily returns home to Rufus and her family to find that things are definitely not as she left them.