A photo of Miley Cyrus on Twitter, in which she is wearing a large diamond ring, has sparked the rumours that the teen pop sensation has got engaged to boyfriend Liam Hemsworth. Thesinger-actress has actually posted the picture on the social networking site to promote a brand of nail polish but the large diamond ring she is wearing on her hand has led to the rumours that the 19-year- old has secretly got engaged to Liam whom she met in 2010 on the set of their film, The Last Song, Daily Mail reported. "They're still keeping it a big secret, but they're seriously talking marriage. Liam is crazy about her! Miley wants the whole nine yards as far as a big wedding goes," a source said.