42-year-old Lopez separated from her husband Marc Anthony last year and is currently dating backing dancer Casper Smart, 25.
The 'Dance Again' singer attended the premiere of her film What To Expect When You're Expecting last month with a red gemstone ring on her left hand, sparking rumours of a possible engagement.
However, Lopez took to her blog yesterday (June 8) to rubbish claims that she was getting married.
"Don't be fooled by the rocks that I got," wrote the American Idol judge, referencing her hit 'Jenny From The Block'. "No engagement!"
Under the title 'The J-Low', she then posted a picture of herself looking over her shoulder and smiling.
Watch the video for Jennifer Lopez's 'Dance Again' (featuring Casper Smart) below: