The ex-girlfriend of Simon Cowell has odds of 1/4 from Paddy Power to be given the chop in tonight's (August 22) live episode, while her eviction opponent and fellow model Rhian Sugden is at 5/2.
The pair were put up for the public vote last Friday (August 17) in a round of face-to-face nominations broadcast live on Channel 5.
Big Brother producers have confirmed that they are monitoring Lennard's behaviour following a series of angry outbursts directed at Sugden and Danica Thrall, who the 27-year-old branded a "prostitute" earlier in the week.
Sugden recently admitted to being scared of living with the former Make Me a Supermodel star and appeared to suggest that the housemates have started hiding knives from her.
Julian Clary is currently favourite to win the series with odds of 5/2, followed by Martin Kemp (11/4) and Cheryl Fergison (9/2).
Big Brother's live eviction show airs at 9pm on Channel 5.