The Britain's Got Talent judge tweeted a note of congratulations to his rival for BBC One's ratings success over the ITV1 talent show last night (April 7).
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"A slightly irritated congrats to Danny and the BBC," he wrote.
Referring to Britain's Got Talent's Ashleigh Butler and her dog Pudsey, he joked: "But you didn't have a dancing dog!"
However, Cowell also put out a message of support for his own show, adding: "I thought our team made a fantastic show last night and congrats to them as well. Loving the show this year."
The Voice UK attracted four million more viewers than Britain's Got Talent during their 20-minute crossover between 8pm to 8.20pm.
Simon Cowell was recently rumoured to have developed a crush on Britain's Got Talent make-up artist Francesca Neill.
> The Voice UK vs Britain's Got Talent: Our verdict
