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Jessica Simpson is a bit of a hot mess these days.

Jessica Simpson got good and drunk as John Mayer, the guy who broke her heart, went public with his new relationship with Jennifer Aniston last week. As we reported earlier, Jessica Simpson and Tony Romo are over. Supposedly, he dumped her because he didn’t believe that she ever really got over John Mayer breaking her heart. Interestingly, Simpson got smashed the same day that news leaked about John Mayer and Jennifer Aniston getting cozy together.

The 27-year-old singer was so out of it after a four-hour session of heavy drinking at L.A.’s Mexicali Cocina Cantina on May 10 – which started at the pre-happy hour of 4 p.m. with BFF CaCee Cobb and her beau Donald Faison – that she was reduced to leaving her Range Rover in the parking lot and calling her mom Tina for a ride home. CaCee was so hammered, she puked under the table where they were partying. Classy.

Adding insult to injury, on Saturday, Jess’s pregnant little sister, Ashlee, is scheduled to marry Fall Out Boy frontman Pete Wentz.