Look out, he'll kill you with cuteness! Zac Efron is back (and yeah, we know he hasn't really gone anywhere). The superstudmuffin and über-genial High School Musical star gets his twinkly-smiley thing cranking while remaining charmingly humble in this backstage vid for his Teen Vogue cover shoot.

Even in featherweight fluff like this, Zac is the mack. Sigh.

We were too busy with our bratwurst this weekend to keep up with Lauren Conrad's busy life, so we missed her on Jimmy Kimmel Live! That's why we love the YouTube. Get ready for topless Emmy gowns, Lauren's 'razzi-dodging tips ("drive real fast on the freeway") and Jimmy forcing L.C. to watch a few seconds of Heidi Montag's writhing-on-the-beach video. Classic.

Oh, did we mention that Jimmy puts Spencer's head on a stick?

While taking a bow for her opening-act stint for the Jonas Brothers in Chicago, singer and Camp Rock star Demi Lovato does an impromptu stage dive, as in, she dives into the stage (about 25 seconds in).

But she once again proves the truism that it's not how many times you fall, but how many times you get up that's most important, by jumping up immediately after the fall and acting like a gymnast who just stuck her dismount.

That's showbiz! Rock on, Demi.

Are you ready to Barack and roll? It was only a matter of time until the Rick Astley RickRoll phenomenon got all political.

Now, instead of getting pranked by seeing Rick's cheesy "Never Gonna Give You Up" video when you click on something else, here we get a cut-and-paste job of Barack Obama dancing on Ellen and then singing/speeching along with Rick's lyrics. Inspirational!

It's Cheese We Can Believe In.

The video-bloggin' hip-hop impresario experiences an exercise epiphany, something about how even amid the day-to-day problems that plague him he suddenly appreciates the blessings of having a healthy body and mind. Try as we might, we can't find a way to snark at his moment of workout Zen. Kudos, Sean! Though perhaps it is a sign of the apocalypse when stars start to talk sense.

Is this just a savvy PR strategy to kill those gay rumors from a few years back? Who cares? B-boys Bert & Ernie prove they've got the gangsta goods in this viral video mash-up with M.O.P's "Ante Up."

Take your unicycle and get lost, Carolla, it's time for Dancing With Miley.

Miley Cyrus and pal Mandy Jiroux's ongoing online dance contest is stepping up to network television, E! News has learned exclusively.

Multiple show sources confirm that Cyrus, who is hosting the Teen Choice Awards on Fox, has arranged to do a series of dance battles against her and Jiroux's rival ACDC male dance crew.

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NOTE: This video contains lyrics that some may find offensive.

Finally, somebody rhymes wiener and vageener! A sexed-up Jamie Lynn Spears impersonator gets stupid fresh (and just plain stupid) with a spirited explanation of where babies come from, including Britney shout-outs, Juno references and jiggly "Jamie" riding a giant bucking-bronco sperm. Yee-haw!

We hope Get Smart isn't as bad as the reviews, but we doubt it'll be as good as Steve Carell's bit last night swapping places with the host last night on Jimmy Kimmel Live.

Jimmy treads water painfully/hilariously while pretending to be Carell, who in turn fakes sincerity so well while playing host Jimmy that we wouldn't be surprised to see Steve behind a talk-show desk some day.

It's the biggest movie this weekend, but the small screen's Hulk is, well, small. Here's why: He's played by Jimmy Kimmel's sidekick Guillermo. But be afraid! Ed Norton not only makes his mini-me mad, he also makes him sob.