Virenia (Nia) Peeples (born December 10, 1961) is an American R&B and dance music singer and actress... Peeples is known for playing Nicole Chapman on the TV series Fame; Pam Fields on the drama Pretty Little Liars; Karen Taylor Winters on The Young and the Restless; Sydney Cooke on Walker Texas Ranger; and as Grace's mom, Susan, on The Fosters.