She will begin her sentence at Los Angeles' Downtown Women's Center, and internet reports claimed the star had already landed in hot water by failing to arrive for work at the homeless charity on Monday morning.

But Lindsay Lohan is adamant the rumours are false, telling GossipCop.com, "I'm not even set to start until next week."

The Mean Girls actress was scheduled to attend an orientation on Wednesday (04May11), but bosses extended an invitation to complete her introduction on Monday evening, according to TMZ.com.