Shields plays Sheila, the biological grandmother of Olivia's (Mariska Hargitay) adopted son Noah.
Over the past few episodes, Sheila has began to grow closer to Olivia and Noah in an attempt to get to know her grandson.
However, many fans think there is more to Shields' character than she lets on.
Some think she will attempt to file for custody of Noah, and other think she has something much more sinister, like an abduction, in mind.
During this week's episode, Sheila opened up to Olivia about her relationship with Noah's mother, Ellie. Fans saw it as just another shady ploy to win over Olivia.
See some of the reactions below.
Law & Order: Special Victims Unit airs Wednesdays at 9 p.m. EST on NBC.
Photo Credit: NBC / Michael Parmelee