Rihanna yawns on stage during London concert

Rihanna has been touring around the world since June and it looks as though her hectic schedule is finally beginning to take it's toll.

The star played yet another show at London's O2 arena last night but was apparently caught yawning on stage.

The 23-year-old has done over 100 dates as part of her Loud world tour and has often been seen coming out of clubs and bars in the early hours of the morning, so it's no surprise that she could do with forty winks.

SEE RIHANNA'S SIZZLING HOLIDAY SNAPS

In November, Rihanna had to cancel a show in Malmo, Sweden due to being hospitalized with the flu and many thought that might be the wake up call she needed to slow down her hectic lifestyle.

This week footage was released of the singer behind the scenes on the shoot for her You Da One video in Hackney, London, where she admits that she's so exhausted she won't 'remember this tomorrow.'

It seems like the Christmas break can't come early enough for Ri-Ri.

Has Rihanna been over doing it? Let us know what you think in the comment box below...