“Bridesmaids” star Rose Byrne has never actually been one in real life. But the sultry beauty told us she will be this summer for her best friend’s wedding in Australia. “I’m looking for tips,” Byrne said at a premiere of the final season of her show “Damages.” “It’s the first time for me.” A guest then offered a pointer: “Do everything the bride says.” Byrne nodded and seemed to be making a mental note when she said, “Be obedient.” Her “Damages” co-stars Glenn Close and Jenna Elfman also celebrated at a swank party at The Plaza Thursday night. But overshadowing the stars’ arrival, the biggest attraction of the evening was a blimp circling the hotel with a screen flashing the cast’s faces. “Wow. That’s pretty cool. That’s huge! I should tell my mother,” exclaimed Byrne when a pal pointed out the airborne billboard overhead. Along with a preview of the legal series’ swan song, guests enjoyed a live jazz band and mingled among on-theme props, like bloody business cards and a red-stained bathtub that was full of wine.