(Reuters) – The escalating battle between No. 2 U.S. mobile service provider AT&T Inc and smaller rival T-Mobile US got personal on Monday night when the bigger operator kicked T-Mobile's outspoken Chief Executive John Legere out of its party at the Consumer Electronics Show, according to Cnet.com. AT&T said last week it would pay T-Mobile customers to switch. According to a Cnet.com report, Legere was escorted out of the Las Vegas event by security guards about 15 minutes after Cnet reporter Roger Cheng posted a picture of himself and Legere and tweeted that the executive had crashed AT&T's party wearing his trademark pink T-Mobile t-shirt. Around the same time that Legere was being escorted out, AT&T's mobility chief Ralph de la Vega was announcing that his company had won a deal to provide wireless connections to Audi vehicles, beating T-Mobile US, Cnet reported.