Miley Cyrus celebrated her 18th birthday by having a dance-off with her mother.

The singer-and-actress reaches the milestone on Tuesday (23.11.10) but decided to have an early party last night (21.11.10) following the American Music Awards (AMAs) where she and Tish Cyrus competed on the dancefloor.

Speaking before the bash, Miley said: "I'm going out dancing later - we rented out a space so all my friends can come. Me and my mom actually have choreography for the night later - everyone loves it when we dance in unison."

Miley says she and Tish - who is currently going through a divorce with Miley's dad Billy Ray Cyrus - often practise their dance moves on a computer game at home.

She said: "There's one move where you do like, the fist pump. You 'Jersey Shore' it for a second! We got a bunch of moves going on. Everyone goes wild when me and my mom have choreography, so it's going to be good.

"My mom, she beats me at that game! She had 600,000 points yesterday, I had 300,000. She is such a good dancer - she really gets it."

Miley has a host of other celebrations planned for her birthday and has revealed she like to celebrate her special day

She told 'Access Hollywood': "I have a birthday month. I do the whole month of November. Thanksgiving, cake - it's all about me on Thanksgiving!"