Taylor Swift. (Handout)

Taylor Swift took aim at ex-boyfriend Joe Jonas and poked fun at rumours she's now dating Taylor Lautner during her guest hosting stint on U.S. comedy show Saturday Night Live.

The Love Story hitmaker took over presenting duties at the weekend and used her opening musical number to laugh about her break-up with the middle Jonas Brother, who famously dumped her in a brief phone call last year.

In a skit titled Monologue Song (La La La), she sang, "You might think I bring up Joe, the guy who broke up with me on the phone, but I'm not gonna mention that in my monologue..."

Swift then sent a personal message to the Love Bug singer, quipping, "Hey Joe, I'm doing real well!"

The 19-year-old star went on to address rumours linking her to Twilight hunk Lautner, fuelling romance reports by winking and blowing a kiss into the camera for him.

She said, "And if you're wondering if I might be dating the werewolf from Twilight - 'Hi Taylor' - but I'm not gonna mention that in my monologue."

And the teenage country sensation also proved she had put Kanye West's rude interruption at the MTV Video Music Awards behind her by joking about the incident in her opening number.

She added, "You might be expecting me to say something bad about Kanye, and how he ran up on the stage and ruined my VMA monologue, but there's nothing more to say 'cause everything's OK, I've got security lining the stage..."

West stormed the stage at the September ceremony to proclaim Swift's prize should have gone to Beyonce.

The rapper was rumoured to be making an appearance on SNL with Swift to win over his critics, but the claims proved to be false.

Swift also portrayed Colombian beauty Shakira in a parody of her hit Hips Don't Lie, renaming the track Bunny Hips Don't Lie.