Grammy Showdowns

Bitter feuds and rivalries among some artists could make for some uncomfortable moments at the 48th annual Grammy Awards as battling stars attend the same ceremony.

Grammy Awards executive producer Ken Ehrlich tells TMZ that anyone looking to start trouble on the show should be warned they could ruin their chances of being invited back. "We've had opportunities on the Grammys to have controversial moments and I don't do it, because I don't want the lead story the next day to be about [the controversy] and not who won awards."

Here's a look at some of the rivalries and feuds that could make the Grammys a showdown to watch:

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• Madonna
• Coldplay
• U2
• The Killers
• Kanye West
• 50 Cent
• Gwen Stefani
• Jay-Z
• R. Kelly

The feud: Madonna reportedly dissed Carey backstage at Live 8 last July in London by saying she didn't want Carey anywhere near her. According to the New York Post's Page Six gossip column, Madonna was overheard saying about Carey backstage, "Just let me know when she leaves her trailer, because that's when I'm outta here. I want to be kept as far away from her as possible." Madonna also reportedly made catty remarks about Carey's revealing clothing at the Live 8 concert.

Why they'll be at the Grammys: Madonna and Carey will each be performing, and it will be the first time the two rival divas will be performing at the same event since Live 8.

Who'll be the Grammy champ: Carey is a leading Grammy contender this year with eight nods. Madonna wasn't nominated this year since her current album, 'Confessions on a Dance Floor,' was released after the eligibility cut-off date. But Madonna's performance (a collaboration with Gorillaz) will probably be more talked about because it's opening the show.

The feud: Late last year, Madonna said about Stefani in an interview, "She ripped me off. We work with a lot of the same people. She married a Brit, she's got long hair and she likes fashion."

Why they'll be at the Grammys: Madonna is performing and Stefani is nominated.

Who'll be the Grammy champ: Depends on how many Grammys Stefani gets. If she wins big, then she wins this feud. If she gets shut out, Madge wins for her show opening performance.

The feud: Coldplay lead singer Chris Martin has said that he wants Coldplay to be the biggest band in the world, and that U2 is Coldplay's biggest competition. In an interview with a British newspaper last year, Martin said that Coldplay's goal is "trying to pump enough logs to take out the Drago that is U2; that's our mission."

Why they'll be at the Grammys: Coldplay and U2 are both multiple nominees and each band will perform at the event. The two bands are competing against each other in the categories of Best Rock Song, Best Rock Album and Best Rock Performance By a Duo or Group With Vocal.

Who'll be the Grammy champ: Grammy favorite U2 will likely walk away with more awards and better performance reviews than Coldplay will. Coldplay is still too much the new kid on the block.

The feud: Killers lead singer Brandon Flowers dissed West in a recent Rolling Stone interview, by saying that West "makes me ill." Flowers continued, "I wanted to love him so much when he first came out. He has this sweet voice, and there's a cuteness to it. And then you see him in interviews and he's like a lion. It just ruined the whole package for me."

Why they'll be at the Grammys: West and the Killers are each nominated. West will also perform.

Who'll be the Grammy champ: No contest. With eight nominations this year and three Grammys under his belt from last year, West is sure to walk away with more Grammys than the Killers.

The feud: Last year, 50 Cent said in an MTV interview, "I feel like Kanye West is successful because of me." After the Hurricane Katrina disaster, when West famously said during a live telethon that President George W. Bush "doesn't care about black people," 50 Cent publically lashed out at West for that comment.

Why they'll be at the Grammys: Each of the rival hip-hop stars are nominated. They'll be facing off in the categories of Best Rap Solo Performance, Best Rap Song and Best Rap Album.

Who'll be the Grammy champ: West is a proven Grammy favorite, winning three Grammys while 50 Cent has been completely shut out. West should also easily sail past 50 yet again this year.

The feud: Jay-Z and R. Kelly have been bitter enemies since their co-headlining 'Best of Both Worlds' tour fell apart in October 2004. Kelly claims he was wrongfully kicked off the tour. Jay-Z claims that Kelly was difficult and unreliable. Both artists are suing each other over the fiasco.

Why they'll be at the Grammys: Both are nominated. Jay-Z is performing. But it's unknown if Kelly will actually show up since his only Grammy nomination this year is for Best Long Form Music Video, a category which isn't televised.