It looks like the drama started even before this couple tied the knot! Heidi Montag and Spencer Pratt, who were celebrating their upcoming nuptials at the swanky Beverly Hills spot Cut last night, had to deal with some last minute wedding trouble, an insider tells Life & Style.

""Heidi's sister Holly got into a huge fight with Spencer. She was crying in the bathroom and moaning about how he was disrespecting her," the insider tells Life & Style. "The next thing you know, she and Spencer are going at it in the front lobby of the restaurant. He was calling her immature and rude and she was crying. It was pretty bad." Of course, the insider adds, the cameras were rolling, "but Holly still seemed genuinely upset."

The drama seemed to stress out Heidi, who stuck to water during the dinner. The meal lasted more than three hours and included over two dozen guests. But however stressed Heidi might have been,"She still looked gorgeous and was wearing a super tight, sexy, black dress!"

The night was capped off with Heidi and Spencer sharing a slow dance in the lobby of the Beverly Wilshire hotel.

We can only hope that the Speidi wedding is less dramatic than the rehearsal dinner!

Photo Credit: INF Photo