First lady showdown! Katie Holmes cannot stop smiling as she compares her Jackie O portrayal to Natalie Portman's

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Grinners are winners, but this smiling star said there is no competition when it comes to playing the Kennedys.

Katie Holmes has weighed in on comparisons between her portrayal of Jackie Kennedy on the small screen and Natalie Portman's on the big screen.

The 38-year-old talked about her role as the famous First Lady in The Kennedys: After Camelot at the CA Winter Press Tour in Los Angeles, California, on Friday.

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First Lady: Katie Holmes talked about her role as the famous First Lady in The Kennedys: After Camelot at the CA Winter Press Tour in Los Angeles, California, on Friday

Katie's show is set to return to Reelz April 2 and Natalie is playing Jackie O in Jackie, which was released in theatres last month.

While some may be intimidating not just playing the role of an iconic figure but playing the same role as an Oscar winner, Katie says she welcomes the situation.

The star told reporters at the panel: 'I think it's really exciting.

'It's a testament to how amazing Jacqueline Kennedy Onassis was, and how much she meant to our country. We are infatuated with her.'

Two od us: The star has weighed in on comparisons between her portrayal of Jackie Kennedy on the small screen and Natalie Portman's on the big screen

Face off: Katie's show is set to return to Reelz April 2 (left) and Natalie (right) is playing Jackie O in Jackie, which was released in theatres last month

The Dawson's Creek star the praised Natalie's performance: 'I think Natalie did an incredible job, and I'm glad that we both had the opportunity to interpret this character and bring her to life.'

Katie did point out, however, that the films are based on different time periods so you can watch both.

'You can watch both and get something different,' she told the audience.

Exciting opportunity: The actress said, 'It's a testament to how amazing Jacqueline Kennedy Onassis was, and how much she meant to our country. We are infatuated with her'

Support: The Dawson's Creek star the praised Natalie's performance saying she did 'an incredible job'

Babe in blue: For her appearance on the panel a very happy looking Katie dressed in an soft and feminine outfit

The star took six months to prepare for the role of the famous First Lady, even though she played her previously.

'It was a bigger challenge because in this series, she's going through so many bigger things.

There is a silver lining to all the prep: 'It's always fun going through Jackie's closet.' 

Grinners are winners: Katie was very animated throughout the discussion flashing her signature smile

Too funny: The actress broke out into fits of laughter during the discussion a number of times

Cast and crew: Katie appeared at the TCA's with co-star Matthew Perry and director Jon Cassar

For her appearance on the panel a very happy looking Katie dressed in an soft and feminine outfit.

The actress wore a baby blue dress with butterfly sleeves and pleated over-the-knee skirt.

Katie was very animated throughout the discussion flashing her signature smile and breaking into fits of laughter a number of times.

Katie appeared at the TCA's with co-star Matthew Perry and director Jon Cassar.

Playing an icon: Matthew stars as Teddy Kennedy and told the audience for a long time he struggled to get his voice right, sounding like 'Foghorn Leghorn' at first

Different direction: Aside from playing Ted, the Friends star has been focused on writing and he will soon star in the play he wrote, The End of Longing, in London

Matthew stars as Teddy Kennedy and told the audience for a long time he struggled to get his voice right, sounding like 'Foghorn Leghorn' at first.

He told reporters: 'I took this job because it scared me.'

Aside from playing Ted, the Friends star has been focused on writing and he will soon star in the play he wrote, The End of Longing, in London

The 47-year-old said to was an emotional dark comedy, 'One time I went to my computer to see how many times I could write the f-word. It was 138. 

'Don't bring your children, but please come.' 

Adults only: The 47-year-old said to was an emotional dark comedy, 'One time I went to my computer to see how many times I could write the f-word. It was 138'