Major Crimes star Mary McDonnell may be known for being hard on her hit TNT show, but the actress is a bit softer in real life. McDonnell tweeted her congratulations to Chelsea Clinton on the birth of her baby.

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On Saturday, McDonnell congratulated Clinton and her husband Marc Mezvinsky on the birth of their daughter Charlotte on Twitter. Clinton had given birth on Friday.

"Marc and I are full of love, awe and gratitude as we celebrate the birth of our daughter, Charlotte Clinton Mezvinsky," Clinton had posted on her Twitter page.

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McDonnell is currently filming the rest of Season 3 of her hit show Major Crimes, which comes back in November.

"I wanted the opportunity to take 'Darth Rader,' as the characters called her, and open her up so people would go: 'You know what, I was pretty quick to judge that woman and I didn't know a thing about her.' And that's what happened," McDonnell said to Daily Dragon Online. "And I'm thrilled with that."

"They change with life," McDonnell recently said about the Major Crimes characters. And they try to live. I appreciate that none of the characters are seriously disturbed, and that's refreshing to me! I just love the humanity of the interactions. That's why they work."

Tags: Major Crimes TNT mary mcdonnell chelsea clinton