Fans who have dreamed of misbehaving with the Gallaghers of "Shameless," and, say, crash a holiday party with Fiona might just get a chance to do so. And it is all for a shamelessly good cause.

Emmy Rossum, who plays Fiona Gallagher on Showtime's hit comedy drama, is urging fans to head to Omaze, the sweepstakes site for once-in-a-lifetime experiences, for "chance to be a Gallagher."

"Showtime is celebrating three of their biggest premieres with one amazing Hollywood party and you and a friend are invited to crash it with me and my hopelessly dysfunctional family," Rossum promises. Apart from the party-crashing experience, the lucky winners will be treated to flights to flights into Los Angeles, a limo ride, a stay at a four-star hotel.

They will also get to meet the clan, a prospect that should give any prospective winners nightmares. After all, "Shameless," titled so for a reason, is centered around the famously dysfunctional family of Frank Gallagher, a single father of six. The series, a remake of a successful British show of the same name, is set in Canaryville, a neighborhood on Chicago's rough South Side.

"I'll sneak you through the velvet rope for a few classy red carpet photos that we'll immediately ruin with photobombs," Rossum, aka Fiona, continues to explain to lure participants. "Inside we can dive right into a full night of debauchery disguised as hors d'oeuvres, drinks, and whatever the hell Frank is doing. Just don't take any Gallaghers back to the hotel when it's over because I'll need to get that security deposit back."

All the fun is for a good cause: Proceeds will be donated to the Foundation For Living Beauty, a non-profit organization dedicated to uplifting the lives of women affected by cancer. Fans have the option of buying "entries" at different levels ranging from $10 to $10,000.

Depending on how much they give, they can increase their chances to win the Los Angeles event and will also get a reward ranging from a digital thank-you card from the cast of "Shameless" ($25) to a Skype style session with Rossum ($10,000).