It's clear that Jason Trawick is confident in his ability to charm his fiancee and ladylove of over two years, Britney Spears, but there appear to be limits to new X Factor judge Spears' devotions.

Trawick posted a video of himself informally singing Night Ranger's 1984 hit, "Sister Christian," to Spears in the car as he drove her to X Factor auditions in San Francisco. "Rode in my 1st @Uber to @TheXFactorUSA auditions inSF today!" Spears tweeted. "Jason auditioned for me — I wouldn't put him through …," she joked on Twitter.

Trawick was anything but discouraged, however. He posted a second video of himself singing an altered version of REO Speedwagon's "Keep on Loving You" for Spears, prefacing his performance by swearing to show Spears that he has "the X Factor."

After the video shows Trawick sing a few bars of his little ditty, Spears can be heard saying, "still no!" in the background. She later took to Twitter again, pleading with followers to post their videos to, "Please send in ur best dance Viddys so Jason will stop!"

The X Factor returns, with Demi Lovato and Spears debuting as judges (replacing last season's Nicole Scherzinger and Paula Abdul), alongside mainstays L.A. Reid and Simon Cowell, on September 12 on Fox.

For more on The X Factor and Britney Spears:

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