British actress Jenna Coleman is reportedly leaving her role as the doctor's companion in the long-running BBC sci-fi series "Doctor Who," the Mirror UK reported.

Coleman is rumored to have quit the show in order to take on the role as a young Queen Victoria in a new ITV drama series called "Victoria."

It's rumored that Coleman has already shot her final scenes with "Doctor Who," according to the Mirror. She will reportedly bow out of her role as Clara Oswald before the show's Christmas special. Coleman was the longest-reigned actress over the Oswald role since the series' 2005 reboot.

"You're in 'Doctor Who' knowing it will never last," Coleman, 29, told the Radio Times, as reported by the Guardian. "It's constantly regenerating, so you want to make your time count and enjoy the adventure for the fleeting time you're here."

Her new role in the drama "Victoria," will take place in the 19th century, according to the Guardian. The eight-part £10 million ($11,278,000) project will feature Coleman's depiction of the queen from when she started her reign at the age of 18 in 1837 and will follow her early life. The show is written by novelist Daisy Goodwin and will be produced by the same team behind the British drama "Poldark."

The BBC has yet to confirm Coleman's departure from "Doctor Who," according to the BBC. United Kingdom network ITV said it wasn't going to make "any announcements about casting presently".