Ex Busted Star Matt Willis is apparently back on the booze after being spotted out on a bender in London.

It�s only weeks since Willis left rehab for his ongoing battle with alcohol, but now it seems he�s back on the demon drink.

Matt played a 30 minute set at the after party for the film John Tucker Must Die at the Paper Nightclub, with his girlfriend Emma Griffiths in tow.

Apparently things soon started to get messy afterwards with Willis drinking dregs from empty glasses.

A source tells the Daily Mirror: �Matt was merry when he announced to drinkers that �this is the woman I�m going to marry.� Then he kissed Emma and everyone applauded.

�But for some reason he then started going around drinking the beer dregs in abandoned glasses, which was a bit weird.�

According to the paper, things took a turn for the worse when they got back to their hotel, with Emma rowing with guests at 5am over comments they made about Busted.

After Matt had confronted the group, he then came over half-an-hour later to make his peace.