(Getty Images | Bauer Griffin)more pics »It seems like the budding romance between punk rocker Benji Madden and Playboy pinup Holly Madison is starting to get serious.
Holly Madison sports a t-shirt reading "Team Benji." (Photo Agency)
The couple, who were first spotted out and about with one another in December, spent the weekend in Vegas, after Benji won a celebrity boxing match against former MTV host Riki Rachtman. "It's heating up between them," says a source speaking to People magazine.
Madison was spotted sporting a "Team Benji" t-shirt, along with some other pals. According to People magazine, the two then headed over to Vegas hotspot Wasted Space, where they ducked away from photogs and spent the evening canooldaling in the VIP section.
The night before, the two joined Benji's brother Joel Madden at by the Palms' N9NE Steakhouse, where they dined before Madison went off to perform in her burlesque show, Peepshow.
See more Holly Madison and Benji Madden pictures (click any photo):