Madonna takes pop at Lady Gaga?
Madonna appears to have made a dig at Lady Gaga during rehearsals for her upcoming tour.
The singer was filmed performing Express Yourself before launching mid-song into a rendition of Gaga's track Born This Way - a song which has often been compared to Madonna's classic hit - while on stage in Israel.
In footage posted on YouTube, the queen of pop then launches straight into She's Not Me, from her 2008 record Hard Candy.
Gaga, with her eccentric style and pop anthems, is seen by some critics as a pretender to Madonna's crown.
Madonna has previously addressed the similarities between Express Yourself and Born This Way. She told The Daily Beast: "I thought, 'What a wonderful way to redo my song'. I mean, I recognised the chord changes. I thought it was... interesting."