After narrowly avoiding a jail sentence, a former reality TV star has offered a single-finger gesture to reporters on her courtroom exit.

Marjorie Griffiths was arrested months after her stint on season 10 of The Bachelor ended and she was charged with supplying commercial quantities of drugs to undercover cops.

The 28-year-old gave media the finger as she walked into Sydney's central courthouse on Thursday and repeated the gesture as she strode out, sticking her tongue out as she left.

A supporter then attempted to block the view of photographers by pouring water onto their cameras.

The fallen reality TV contestant delivered more than 1kg of cocaine to an undercover operative in a deal worth $US240,000, according to court documents.

When the officer asked how much was in the bag she

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