Lady Gaga is on a mission to look her best at a childhood pal's upcoming wedding in a bid to exact revenge on the mean girls who bullied her at high school.

The pop star has been helping her best friend from school organise her upcoming nuptials, and even took her to Vera Wang's New York City boutique in August to try on bridal gowns.

And the Bad Romance singer admits she wants to look stunning at the celebrations as she wants to impress fellow guests, including the girls she grew up with who were cruel to her.

She tells Stylist magazine, "I was kind of afraid to admit this, but I'm just going to say it anyway, 'cos I think my fans will really appreciate it. I am throwing my best friend an engagement party this weekend, and I'm going to be seeing all these girls from high school, and I would be totally lying to you if I didn't say I was worried about how I'm going to look!

"I was saying earlier, 'I have to look fabulous, I have to look absolutely amazing, some of them were horrible to me!'"