Singer's public display may well have been the controversial reality star's attempt to keep up with her ex-husband Mario, who began very publically hitting the party scene last fall with his much younger socialite gal pal Kasey Dexter. On Sept. 29 Confidenti@l reported that Mario and Dexter were spotted "engaging in a PDA-packed night in front of shocked guests" at an Upper East Side steakhouse, where a source told us that "Mario introduced her as his girlfriend, and said loudly to whoever would listen, 'My life is better now, it just keeps getting better and better.'"