After lots of speculation, James Gunn told Newsbeat she's in the new film for "half a second".
He said the wrecking ball singer agreed to voice a new character alongside legendary actor Sylvester Stallone.
The film is out on 28 April, reuniting the cast from the original movie which came out almost three years ago.
"Well I can't really tell you guys because it's a spoiler in itself to talk about it," the director explained.