From American royalty (Conor Kennedy) to a newly-minted boy band prince! The new Us Weekly, out now, has brand-new details on Taylor Swift's flirt-fest with One Direction's Harry Styles at an X Factor performance rehearsal in L.A. Nov. 15.

"They lit up when they saw each other," an observer tells Us of freshly single Swift, 22, and the British crooner, 18. Spending much of the day together, Swift "was a puppy dog," the observer marvels of the "I Knew You Were Trouble" singer; Styles watched her rehearse while sitting with her mom, and even sang along!

After walking hand-in-hand on set, the duo made a dramatic, romantic exit: "Harry picked her up and carried her to the trailer!"

And it wasn't the first day of interaction for Styles and Swift, who split with Conor Kennedy back in October. "They email a lot!" a pal says. (via UsMagazine.com)

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Kelly Clarkson Is Totally Going To Get Married

The "bad" news: Kelly Clarkson and boyfriend Brandon Blackstock are not engaged.

The good news: It's only a matter of time until they are!

The "Mr. Know It All" singer, 30, chatted with Ellen DeGeneres during a Tuesday Nov. 20 appearance on ELLEN about rumors that she and the Nashville-based talent manager are already set to tie the knot.

"Everyone thinks we are [engaged]. We're not," Clarkson explained. "We've actually been dating for nine months."

Still, the inaugural American Idol is more than hopeful that she'll be Mrs. Blackstock one day.

"We are totally going to get married. We love each other," she gushed of Blackstock, who's the son of Clarkson's longtime manager Narvel Blackstock, and the stepson of Reba McEntire. "We are totally going to get married one day. No, he has two children and I'm new … I mean, he's got to put it a ring at some point."

But the typically low-key Clarkson is happy to "wait it out," she told DeGeneres -- and don't expect bridezilla-like antics from this superstar.

"Honestly, I've never been the girl to plan a wedding . . . We will totally, probably elope." (via UsMagazine.com)

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LOVE Bridgit Mendler --- "Ready Or Not"