Welsh Actress Catherine, Who Starred in Chicago

Word Meaning:

ZETA — The sixth letter of the modern Greek alphabet (Ζ, ζ) preceded by epsilon (Ε, ε) and followed by eta, (Η, η); or the seventh letter in the ancient Greek alphabet, in which it is preceded by digamma (Ϝ, ϝ)

Definitions from Wiktionary.