It's Over! Gerard Butler & Girlfriend Morgan Brown Split

Gerard Butler and on-again, off-again girlfriend Morgan Brown are officially off. RadarOnline.com can exclusively reveal the actors have ended their years-long relationship. "Gerard is back on the market," a source told Radar. "He and Morgan split up again." The actors reportedly had a "horrible argument" that ended the romance. PHOTOS: Dumped! Ben Affleck Nanny Christine