Several Web sites reported this week that Britney Spears has hooked up with fellow pop singer Howie Day of Brewer, Maine. The two met earlier this year while both were residents at the Promises Malibu Alcohol and Drug Rehab Treatment Facility, according to gossip columnist Jeannette Walls of MSNBC.com. Spears’ mother, Lynne, is not happy about her daughter’s new romance because Day has been arrested twice and was sent to rehab as part of his probation, according to Walls. “Lynne wants Britney to be with someone outside the music industry,” Walls reported a family insider saying. Day was returning home to Maine for the holidays on an American Airlines flight in December 2005 when prosecutors say he became verbally abusive to the flight crew. He was found guilty of interfering with a flight crew and sentenced to one year of probation as well as ordered to complete an alcohol counseling program. In March 2004, Day was arrested in Madison, Wis., for allegedly locking a woman in the bathroom of a tour bus after she refused his sexual advances. The singer-songwriter received critical acclaim for his 2003 album, “Stop All the World Now”