Continuing her uber-successful Circus World Tour, Britney Spears was in the house at the O2 Arena in London, England last night (June 11).

The “Gimme More” songstress gave a killer performance along with an elaborate stage show and plenty of costume changes.

In related news, “Transformers: Revenge of the Fallen” actress Megan Fox recently empathized with Britney’s crazy life during an interview.

Fox said, “I used to sit back and think, ‘Please, Britney Spears has the best life ever.’ She has everything she could ever want.  But she has one of the worst lives. Her life is a living f—ing nightmare. I have panic attacks thinking about her life.”