Britney Spears' on-off comeback shows are now heading for Las Vegas. The pop superstar was supposed to appear at Los Angeles club Forty Deuce last week (ends27Apr07), but cancelled the showcase, and, as WENN went to press, shows at California House of Blues venues in San Diego (01May07) and Anaheim (02May07) had also been called off - even though they remained on the venues' websites. There are still reports a planned show by Britney and her M+Ms group will go ahead as planned at the House of Blues in Los Angeles on Thursday (03May07), and now a show has been added in Las Vegas for the House of Blues at the Mandalay Bay resort on Sunday (06May07). Insiders claim the M+Ms is Spears and her backing dancers and the Toxic singer has been hoping to debut new material as part of the shows.