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Tina Fey is set to play a sister in her upcoming film Sisters, but she has a different set of siblings on her mind—her two daughters. 

While sitting down with Ellen DeGeneres on Wednesday, the SNL host reminisced about her last visit to the show's set.  

"The last time I was here I was pregnant," Fey recollected about 2011 when she was expecting her daughter Penelope, who is now 4 years old. Fey also has an older daughter, Alice, 10, both of whom she had with husband Jeff Richmond

While Alice and Penelope may be sisters raised under the same roof, the comedian asserted they're not exactly alike.   

"My older one is sweet and really easy going and my little one is rough," she said of the two little ladies. 

 Penelope may be a tough cookie, but that quality doesn't come without some brains. 

"She is smart. That's the problem, too," Fey admitted. "When she is mad at you, she will just take you apart."

Tina Fey, Alice Zenobia, SAG Awards, Oscar de la Renta

Matt Sayles/Invision/AP

DeGeneres was concerned, asking the acclaimed comedian what she does to keep her daughter in line, particularly with the holiday season in full swing. 

"I struggle because I worry she will be on the naughty list," Fey joked. "There are times where I feel she should be on the naughty list, but then if that happens then there will sort of be hell to pay for mommy. I don't want to be the one there on Christmas morning, be like, 'Guess what happened? Coal. You got nothing.'"

"But, it's Santa that's doing it," DeGeneres added. 

Fey was clearly surfing the same brainwaves. "Exactly," she replied.

Uh oh, Penelope! Perhaps she needs to take a note from her "sweet" older sister before it's too late with Santa.