Showtime's "Shameless" actress Emmy Rossum, who plays Fiona, has no qualms -- or 'shame' about dishing on the best part of filming Season 5 of the hit TV series.

Rossum, who wore a black jumpsuit while heading out for lunch with her boyfriend Sam Esmail at Il Pastaio on Friday, Sept. 19 in Beverly Hills, California, revealed on Twitter that "night shooting" was the best part of filming the popular TV series, according to Just Jared.

"Best part about night shooting is getting to have lunch with my friends during the day. Welcome to la, @doriegolkin," Emmy wrote on Instagram with a pic."

The 28-year-old actress was reportedly joined by one of her best friends, Dorie Golkin Smith, one of the co-founders for Of Mercer. Rossum reportedly was seen wearing EF Collection earrings, Capwell & Co. necklace, Three Floor trousers, and carrying a Bally bag.

Apparently, Rossum's co-star, William H. Macy also likes night shooting. On Sept. 18, Macy tweeted out about his "first night shoot" with Rossum.

While Rossum is not as fashionable on the set of "Shameless," her character may catch the eye of newcomer Dermont Mulroney who will be joining the show as Sean Pierce, "a recovering addict and the new manager at Patsy's Pies" where Fiona works, according to TV Line.

There are rumors swirling about that Pierce's "innocent relationship with Fiona will grow more flirtatious when Season 5 airs," TV Line adds.

In other "Shameless" Season 5 news, actress Emma Rose Kenney also recently commented on Twitter about filming Season 5.

If you haven't watched "Shameless" yet it's a "fiercely engaging and fearlessly twisted series that zeroes in on Chicagoan Frank Gallagher (Macy), who is "the proud single dad of six smart, industrious, independent kids, who without him would be ... perhaps better off," according to Showtime.

"When Frank's not at the bar spending what little money they have, he's passed out on the floor. But the kids have found ways to grow up in spite of him. They may not be like any family you know, but they make no apologies for being exactly who they are."