Catherine Zeta-Jones has taken to social media to share a rare picture of her kids - son Dylan, 20, and daughter Carys, 17.

Per news.com.au Zeta-Jones has been spending time with the pair since they quarantined together over summer but now they are both set to return to their studies, prompting Zeta-Jones to share the heartfelt image.

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The actress captioned the picture:

"Summer officially over in our family. Today both our young adults go back to studying. In different, unprecedented ways. I love you both... And to all kids out there. Knowledge is the key to life. So battle through. This too shall pass.(photo by mamarazzi, CZJ)"

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And fans took to the comments section to wish the family well.

"Best of luck with their studies and in Life all the best" wrote one fan, while another added, "Godbless you both..:) Yes, knowledge is the precursor to the experience of life"

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"Beautiful children. Best Wishes For A Safe & Healthy School Yr." A third commenter wrote.

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Earlier this year, Catherine Zeta-Jones's husband Michael Douglas shared a moving tribute to his late father Kirk Douglas. He wrote on Instagram, "I miss him so much! Cherish your Dad while you have him".

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Kirk Douglas passed away earlier this year on February 5, at the age of 103. Michael Douglas wrote a heartfelt statement at the time, saying of his father;

“To the world, he was a legend, an actor from the golden age of movies who lived well into his golden years, a humanitarian whose commitment to justice and the causes he believed in setting a standard for all of us to aspire to.

“But to me and my brothers Joel and Peter he was simply Dad, to Catherine, a wonderful father-in-law, to his grandchildren and great grandchild their loving grandfather, and to his wife Anne, a wonderful husband.”

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She wrote, "Michael joins me in thanking you all for your overwhelming love,kind words and prayers since the passing of my father in law Kirk. My whole family appreciated every word. Love to you all".

Catherine Zeta-Jones shares rare photo of her son and daughter on Instagram