Paula faces off against Heidi and Spencer and Frankie Dettori in this Wednesday's public vote and eviction (January 9).
Paula has odds as short as 8/15 that she'll be given the boot in midweek.
Heidi and Spencer can be backed at 6/4, while jockey Dettori is expected to survive with odds of 12/1.
The early favourites to win the series are X Factor reject Rylan Clark (6/4) and Neighbours actor Ryan Maloney (4/1).
Celebrity Big Brother airs every night on Channel 5.
Celebrity Big Brother 2013 latest pictures: