On Monday, just as Louisiana native Britney Spears announced that she will celebrate Mardi Gras in New Orleans this year, U.S. Transportation Secretary Norman Mineta chided the pop tart, calling her "irresponsible" for hooking up with K.Fed driving with her baby son on her lap as shown in pics that surfaced last week. "No matter who you are, there's absolutely no excuse," Mineta said at an event, where he also announced a $25 million initiative to enact tougher booster-seat laws.