ET has the latest...

The divorce trial between Christie Brinkley and Peter Cook is already revealing bombshells!

In the opening statements, Brinkley's lawyer claimed that Cook spent thousands of dollars on Internet pornography and also claimed Christie had to pay for her own Mother's Day flowers because Cook would charge them to her account.

It was then Cook's turn to take the stand, where he stated under oath that he had a sexual relationship with Diana Bianchi, saying the affair lasted less than a year. He also said he bought her Victoria's Secret lingerie and a $2,000 watch.

Diana Bianchi also testified today, but didn't speak to the press on her way into the courthouse.

Alexa Ray Joel, the daughter of Christie and her ex-husband Billy Joel, testified today as well. She revealed an incident regarding a water leak, saying Cook allegedly stormed into the bathroom while she was taking a shower and yelled at her to get downstairs to "clean this mess." She claimed that she was not given a chance to get dressed before Cook forced her to go downstairs, and that he pushed her head into the leaked water and forced her to clean it up while she was naked.