Aside from the occasional Twitter feud with Perez Hilton, Brit-pop bad girl [artist id="2389411"]Lily Allen[/artist] has mostly been on her best behavior lately. But on Thursday, the "Everyone's at It" singer reportedly unleashed her powerful right hook on a paparazzo who allegedly bumped into the back of her car while pursuing her.

The Telegraph reports that Allen took a swing at the unnamed photog before being pulled back by one of her security guards following the alleged rear-ender. The paper has a photo of the alleged incident, in which Allen can be seen swinging her right fist and apparently missing the face of an unnamed man as a minder holds her left arm.

A spokesperson for Allen count not be reached for comment at press time. The singer is currently touring Britain in support of her recent album It's Not Me, It's You, but several British media outlets have speculated that if the photographer decides to press charges, or a police investigation results in an arrest for Allen, it could put her upcoming U.S. tour plans in jeopardy. Allen is scheduled to begin a month-long North American tour on April 1 at the House of Blues in San Diego, according to her Web site.

This week, fellow British bad girl [article id="1606544"]Amy Winehouse was forced to cancel her appearance at next month's Coachella Festival[/article] in Indio, California, because she was recently charged with assault and was having problems obtaining a visa for the gig as a result. Allen had her U.S. working visa revoked in 2007 after officials questioned her at the Los Angeles airport over an arrest earlier that year for a similar incident involving a paparazzo. The revocation resulted in [article id="1567366"]Allen missing that year's MTV Video Music Awards[/article] ceremony in Las Vegas, where she was up for Best New Artist.

London's Metro had more photos of the alleged incident, in which Allen is seen chucking a water bottle at an unseen person and kicking the camera-wielding paparazzo in the leg as he smiles and tries to deflect her attack.

Allen's current single, "The Fear," addresses her frequently contentious relationship with the constant swarm of photographers who chronicle her every move in England, with the lyrics, "I'll take my clothes off and it will be shameless/ 'Cause everyone knows that's how you get famous/ I'll look at the Sun and I'll look in the Mirror/ I'm on the right track -- yeah, I'm onto a winner."