The opera singer laughed off the romance rumours in a recent interview with The AP.
"We knew each other for just 12 hours, and in the press it is we are now dating," Jenkins joked.
Jenkins split from fiancé Gethin Jones in December and recently admitted that it's been "difficult" to perform love songs since the break-up.
The Welsh mezzo-soprano missed the Dancing with the Stars cast unveiling last month because she was previously committed to entertaining the troops in Afghanistan.
Her trip was ultimately cancelled, however, when "technical problems" prevented her airplane from landing in the Middle East.
Jenkins joins fellow celebrities Sherri Shepherd, Maria Menounos, Jack Wagner and Gladys Knight on Dancing with the Stars, premiering Monday, March 19 on ABC.
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Watch Katherine Jenkins perform 'Abigail's Song' from her guest-starring role on Doctor Who below: