Beyonce has apologised to fans after cancelling a concert in Antwerp.

The singer has posted a self-penned note on her Facebook page - saying it was a 'very hard decision to make'.

The official line is she has been suffering from exhaustion - although it's rumoured she may be pregnant.

Beyonce played Dublin last weekend, where rumours circulated that she might be expecting, after she instituted a ban on all photographs at the event.

It's a big week for the Texan singer, Baz Luhrmann's movie The Great Gatsby's getting its premiere at the Cannes Film Festival - Beyonce and husband Jay-Z both contributed to the soundtrack.

In fact film is opening the French festival. Its stars Leonardo DiCaprio and Carey Mulligan are expected on the red carpet in the south of France tonight.

Beyonce pictured above at last weekend's gig in Dublin O2

Image courtesy of Eleanor Rosney.