Coachella 2012: Which Big Guests Might Return For Weekend 2?

Mark Davis/Getty Images for Coachella

With the second of weekend of Coachella in full swing, and temperatures hovering over 100 degrees this afternoon, the clearest difference between the inaugural twin outings for the Indio, Calif., festival will likely be the weather. Last weekend got off to a cold, soggy start, warming to only the mid-80s in time for Sunday's finale.

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As for the music, identical bills and set times have Coachella 2012: Part Deux poised to be a repeat performance, with a few exceptions. Busy schedules, fewer big parties and no element of surprise might leave some of last weekend's most memorable cameos off the docket. Sure, there are bound to be a few duplicates and a few twists of its own, but who were the biggest surprise stars of last week -- and what are the chances of seeing them again?

Here's a quick rundown:

Usher
Last Saturday, Usher popped up behind David Guetta at the Sahara tent DJ booth towards the beginning of his set. At the end of the show, just as the crowd was getting ready to move on, he came back out to sing their hit "Without You." Casual research shows Usher's weekend is open, but given the long list of Guetta collaborators -- Will.I.Am, Jessie J and Jennifer Hudson among them -- we'd be less surprised to see another big name show up for the second go-around.

Rihanna
The singer appeared to have herself quite a time during weekend one. She made appearances at several parties, got a little flack for photos supposedly depicting marijuana use -- at Coachella, of all places -- and ultimately performed alongside Calvin Harris for two songs during his Sunday night set, including "We Found Love." It seems unlikely she'll pull a repeat performance. A suitable substitute? The slightly less-exciting Kelis, whose vocals on Harris' "Bounce" always go over well.

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50 Cent and Wiz Khalifa
Snoop Dogg and Dr. Dre put everyone else to shame on Sunday night, with a roster of cameos including 50 Cent, Wiz Khalifa, Eminem and an apparition we'll get to in a moment. Can the group of super-friends all reunite for a second time? Unlikely. Since he was added to the bill before last weekend, Eminem's repeat collaboration with Dr. Dre and Snoop Dogg is pretty much a given, and Khalifa probably wants to promote his current single with Snoop ("Young, Wild and Free"), but 50 Cent seems like a once-off. In their stead, is it so much to ask that Ice Cube drop by? The rapper-turned-actor recently announced to plans to tour, and there's no better jumping off point than Coachella.

The Tupac Hologram
They did not drop all that dough on the digital reincarnation of one of rap's most beloved fallen stars to waste him on just one performance. The Tupac hologram's immediate entry in the zeitgeist after last week's debut means his appearance will be one of the most-anticipated moments of this weekend. The real question is if he's taking any requests.