Is Caitlyn Jenner the ‘mystery’ Celebrity Big Brother housemate?

Caitlyn Jenner has stoked speculation she is heading into the Celebrity Big Brother house after flying into the capital on Thursday morning.

Jenner, 68, was spotted at Heathrow airport, leading fans to believe she is making her way to the Borehamwood bungalow.

The reality TV star looked casual in a pair of blue demin jeans and a brown top as she pulled a small suitcase behind her.

Jenner is booked in for an appearance on Adam Hills’ The Last Leg this Friday, but that hasn’t stopped speculation she could be a later addition to the reality show.

Jenner’s arrival comes amid reports show bosses are scrambling to find a final big name ahead of tonight’s launch show after being left with one spare slot.

A source told The Sun Online: “Everyone is now in hiding ahead of the show starting tomorrow but there’s an empty hotel room still waiting to have someone check in.

“The bosses have been trying to sign this person up for a while but there have been issues along the way and their contract is still very much blank.”

Fourteen housemates will be welcomed into the famous compound by host Emma Willis tonight.

A leaked list appeared to confirm US star Kirstie Alley, former soap actors Ryan Thomas and Roxanne Pallet and former Love Island contestant Gabby Allen.

Other names in the mix reportedly include TV psychic Sally Morgan, US adult film star Stormy Daniels, the ‘Human Ken Doll’ Rodrigo Alves, and former TOWIE star Dan Osborne.

Kidnap victim Chloe Ayling, Married At First Sight’s Ben Jardine, footballer Jermaine Pennant, US reality star Natalie Nunn and Nick Leeson, who was famed for losing Barings Bank more than £800 million through fraudulent trades, are also expected to star.

Celebrity Big Brother is on Channel 5, tonight at 9pm