Frankie Cocozza is a longstanding rumour, having been linked to the show almost immediately after he was axed from The X Factor. Brian Dowling appeared to hint at his inclusion during an interview with Digital Spy, but Cocozza's contracts with Syco and ITV may prevent him from taking part.
Other hot tips who look likely to make the final cut include Reservoir Dogs actor Michael Madsen, British comic Ruby Wax, Pineapple Dance Studios star Andrew Stone and TOWIE's Kirk Norcross.
Ex-EastEnders actress Natalie Cassidy and former Corrie star Denise Welch's names have been swirling around the rumour mill for several weeks, while Kristina Shannon and Karissa Shannon (Playboy twins) look to be the perfect fit for Celebrity Big Brother on Channel 5.
The final two strong rumours are models and Twitter rivals Nicola McLean and Natasha Giggs. At least one of them will be entering the show tonight. McLean, who has the same management as Channel 5 favourite Amy Childs, looks like the closest thing to a certainty.
This year's 'Charlie Sheen rumour' is Lindsay Lohan. Her name is likely to add some viewers to the launch night ratings, but curious fans will probably be left disappointed by her absence.
Celebrity Big Brother typically throws up a couple of surprises on launch night and we suspect this evening will be no exception.
Boy George has insisted on Twitter that he isn't going in, but maybe he was throwing us off the scent. Wiley, Lee Ryan, Duncan James and MC Romeo are among a list of male popstars mentioned on the Digital Spy forums.
Singer and Big Brother fan Jamelia and reality TV staple Calum Best's names have cropped up on various fansites, but they are linked to the show every year without fail.
X Factor legend Wagner Carrilho's name started swirling around the Twittersphere yesterday after confirmation that there had been a last-minute change to the lineup. Meanwhile, model Georgina Salpa's management released a message on her Facebook claiming that she had already entered the house. Did someone press the return key on their keyboard a day early?
And as for this year's 'Bobby Sabel (who?) moment', how about model Jay Camilleri, US actor Lorenzo Lamas or Britain's Got Talent reject Sean Smith.
However, our favourite wildcard rumoured housemate of the day is WWE wrestling legend Rowdy Roddy Piper. It doesn't sound beyond the realms of possibility that Hod Rod could enter the house tonight, and we'd love to see him getting ready to rumble down Elstree.