In a photograph, a white three-wheeled decorated motorcycle was seen with Miley's initials 'MC' put up on the front part of the bike, reported TMZ.
Miley, who turned 21 on November 23, apparently celebrated her milestone in a low-key bash.
The singer shared a photo of a delicious-looking cake which she received from her friend.
"The gayest birthday cake ever," Miley wrote on Twitter. The birthday cake consists of several layers with different colors. It was covered with icing on top and also had sprinkles as well as candles.