Feminine Masculinity (Chinese: 先生貴性), also known as Mr. Diana, is a 1999 Hong Kong television drama produced by TVB.

It stars Gallen Lo, Flora Chan, Kwong Wa, Nicola Cheung, Angela Tong, and Florence Kwok.

Thinking that KUEN is an object of public opinion, Ching, a tough competent businesswoman invites him to star in a commercial.

During their co-operation, the arrogant, self-assured Ching has had a number of clashes with the egotistic Kuen, a most typical masculinist.

Her spirit transmigrates into Kuen's body and disguises as a returned overseas Chinese named Diana.