Big Brother's returning houseguests have apparently been revealed prematurely by the show's live feeds.

The identities of the four prior Big Brother houseguests who will be part of the show's fourteenth season when it premieres tonight appear to have been revealed accidentally during a test of the show's live Internet feeds on Tuesday night.

According to screenshots captured by live feed viewers, the four returning Big Brother houseguests -- whom CBS has deemed "four of the most successful players of all-time" -- will be Britney Haynes, Dan Gheesling, Mike "Boogie" Malin, and Janelle Pierzina.

Britney finished fourth on Big Brother's twelfth season in 2010 while Dan won the show's tenth season in 2008. Janelle placed third on Big Brother's sixth season in 2005 and also finished third on Big Brother: All-Stars in 2006.

Mike originally competed on the second season of Big Brother in 2001 and won Big Brother: All-Stars in 2006.

Last week, CBS announced Big Brother's fourteenth-season cast will feature twelve first-time houseguests and four unidentified returning players that would be kept under wraps until the season, once again hosted by Julie Chen, premieres on Thursday, July 12 at 9PM ET/PT.  

The network has also declined to reveal how the returning contestants will be integrated into the season, stating only that they will be playing "their own game" and competing for a prize "separate" from the competition's regular $500,000 grand prize.