The 43-year-old Welsh born actress, who now resides in the US with her husband Michael Douglas, was the recipient of the prestigious degree along with Matthew Rhys and Rhys Ifans, Contactmusic reported.
"We are delighted to honour these distinguished artists who have achieved international distinction in their field.
"It's exciting to welcome these prestigious fellows in the same month that the Royal Welsh College's training was ranked in the Guardian University League Tables among the top five UK conservatories for its music and the best in the UK for drama training," Hilary Boulding, Principal of the Royal Welsh College said.