MILEY CYRUS' August (14) dates in the U.S. have been given an added dose of girl power - she'll be joined by Lily Allen.

The outspoken Brit will join Miley on the next leg of her Bangerz world tour for seven dates, beginning on 1 August (14).

The support shows will serve as a warm-up for Allen's upcoming North American dates, which are scheduled to begin in Miami, Florida on 9 September (14).

The Smile singer is a big Miley fan and called the Wrecking Ball hitmaker "a fearless b**ch" during a show in New York in May (14).