Singer Jennifer Lopez has some new bling -- not a new fiancé. The “American Idol” judge was spotted with a new sparkler on her ring finger, but she quickly denied reports that her and boyfriend Casper Smart are engaged.

Jennifer Lopez and Casper Smart Engaged?
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"Rumors!!! Don't be fooled by the rocks that I got," she wrote on her website. "No engagement!" 

She ended the blog post with the question, “What’s the best way to stop a false rumor?”

This is the second false alarm for Jennifer, 42, and her dancing beau, Smart, 25. A false tweet by designer Roberto Cavalli (his account was hacked) in March asked, "Today , Jenifer Lopez. Call me...... She ask me. To create a special dress. For her next wedding! Which color ... Do you advise me?"

His reps quickly shut down the rumor, telling People that it was “completely false.”