TMZ.com is also covering the story, which adds that Lee walked to the backstage area on her own power.
UPDATE: As reported earlier today, WWE Divas Champion AJ Lee collapsed during her match against Brie Bella at tonight's WWE live event in London, England.
According to some attendees at the show, Lee fell off the ring apron and hit the floor. The match was called off and she was tended to at ringside by medical personnel and subsequently assisted to the backstage area.
Regarding the matter, WWE issued the following statement to us: "Tonight in London, WWE Diva AJ Lee briefly fainted during a match with Brie Bella due to dehydration. She is currently being evaluated by WWE medical staff."
We reached out to a WWE source at the show to ask whether Lee is going to be okay. The source gave a simple "yes" response, and added that there has been no determination yet as to what caused her to collapse.
This is a developing story, stay tuned for updates.
Today's show in London marks as the tenth day of WWE's grueling two-week tour across Europe, which has been described as exhausting.
ORIGINAL: During today's WWE house show in London, AJ Lee collapsed during a match in which she was defending the Divas Title against Brie Bella. The match was called off and WWE officials tended to her; she was walked to the back after several minutes.
The current European tour has been described as "exhausting." It is not yet known if that is why AJ collapsed.