Emmy Rossum, from "Phantom" to "Shameless"

Emmy Rossum on "CBS This Morning."
Emmy Rossum on "CBS This Morning."

Actress Emmy Rossum is perhaps best known for her role as Christine in the 2004 film adaptation of the Broadway hit, "Phantom of the Opera." She was just 18 then. Now 25, the Golden Globe-nominated actress stars in the Showtime series, "Shameless."

Pictures: Emmy Rossum

Rossum plays Fiona Gallagher, a young woman who takes on the mom role in the family, while her dad, Frank -- played by William H. Macy -- is a drunk. "Shameless," now in its second season, is adapted from a long-running, award-winning British television drama of the same name.

On "CBS This Morning," Rossum, an only child, said her role has given her a look into what having a big family would be like.

"At the beginning of the show, when we rehearsing...the producers kind of gave me $80, and said, 'Here's a minivan, take all of these kids to putt putt (golf), feed them, change them, deal with them. Also, deal with Bill Macy. It was that kind of idea. I got thrown into it pretty quickly," Rossum said.

She added, "I always wished I had a bigger family. Coming into this show, I immediately bonded with everyone, because I think I really craved that."

Rossum said the cast of the show gathers at William H. Macy and Felicity Huffman's house to watch each episode together.

"(Felicity) makes a roast chicken," she said. " ... If the kids are there, we cover their eyes during the naked, naughty bits. We're a cable show. It really is good."

For her thoughts on that role, how she has acclimated to Hollywood and more, watch the video in the player above.