The spinoff show's former presenter Emma Willis was recently confirmed to replace Brian Dowling as presenter of the main Channel 5 programme, leaving a vacancy on its sister series.
According to The Mirror, ticketing website Applause Store tweeted from its official account about securing free Big Brother tickets, with both Willis and Clark's monikers linked into the post.
The company posted: "B the 1st for #freetix to #BB13 @bbuk with @Emma_Willis + @RylanClark," although the multiple tweets were all deleted soon after posting.
A spokesperson for Channel 5 declined to comment.
The 24-year-old former X Factor star won this year's series of Celebrity Big Brother, beating Heidi & Spencer and Ryan Moloney.
Speaking about her new job as host of Big Brother, Willis said: "I am thrilled to have been offered this job. I'm a fan first and foremost so to be able to front the show is going to be amazing. Roll on the summer!"