Heather Locklear, born on September 25, 1961, in Westwood, California, is a renowned American actress who gained fame through her captivating performances in television and film. She rose to prominence in the 1980s with her role as Sammy Jo Dean Carrington in the hit TV series "Dynasty". Locklear's portrayal of the complex and scheming character showcased her acting prowess, making her a household name and earning her widespread recognition.

However, there seems to be some confusion in your request regarding her appearance in "Two and a Half Men" Season 1, Episode 21 in 2004. Heather Locklear did not appear in the show during that time. Her notable contributions to the entertainment industry primarily come from her work in other television series, such as "Melrose Place" and "Spin City" which solidified her status as a respected actress.