The wedding buzz began last week when Sparks posted some cryptic remarks on Twitter.
"Yes I'm excited for my babe to perform but that's not why I'm FREAKING OUT!" and "*JUMPS ON BED & SCREAMS!!!* (sorry to the people in the room under me)."
The performance Sparks references was Derulo's New York City show last Thursday night, which was part of the iHeartRadio Live Coca-Cola Summer Concert Series.
Although the reason Sparks was "freaking out" remains unclear, a source close to Derulo told E! News, "They are not engaged at all."