Vice Presidential candidate Sen. John Edwards was caught visiting his mistress and secret love child at 2:40 this morning in a Los Angeles hotel by the NATIONAL ENQUIRER.

The married ex-senator from North Carolina - whose wife Elizabeth continues to battle cancer -- met with his mistress, blonde divorcée Rielle Hunter, at the Beverly Hilton on Monday night, July 21 - and the NATIONAL ENQUIRER was there! He didn't leave until early the next morning.

Rielle had driven to Los Angeles from Santa Barbara with a male friend for the rendezvous with Edwards. The former senator attended a press event Monday afternoon with L.A. Mayor Antonio Villaraigosa on the topic of how to combat homelessness.

But a months-long NATIONAL ENQUIRER investigation had yielded information that Rielle and Edwards, 54, had arranged to secretly meet afterward and for the ex-senator to spend some time with both his mistress and the love child who he refuses to publicly acknowledge as his own.

The NATIONAL ENQUIRER broke the story of Edwards' love child scandal last year, when Rielle was still pregnant and Edwards was still considered a strong candidate for the Democratic presidential nomination.