I sure it's because she was a linguistic feature called Intrusive R, it's where an R is inserted between two vowels where no R should be. I believe most English and Australians have Intrusive R's but they seem largely oblivious to it.
Here's a link describing it:
http://slb-ltsu.hull.ac.uk/awe/index.php?title=Intrusive_'r'

She's an awesome host Watch the Canadian SYTYCD and you will realize how great Cat is at her job.

I am an American and I won't complain about how she says America (or AmericER) when people from the northeast of my country say ideaR instead of idea. Every country has its' own quirks of pronuciation. My main complaint about Cat is that I have no idea why she is even vaugely qualified to host "So You Think You Can Dance".

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Yes!!!! This is the one that makes me scream.
And, I'm confused on the aluminum. It's a-loo-muh-num. WTF with a-loo-min-ee-um?

She also says "jidges" instead of "judges". I feel like I'm watching Eliza Doolittle.

http://rightonpeachtree.blogspot.com/

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I think of pronouncing "girl" to rhyme with "barrel" as an Irish thing, pretty much exclusively.
I don't have a license, but I drive very well, officer!

barrel? wtf we must pronounced that differently aswel because it does not rhyme with barrel. you must pronounce it bur5b4rel. Anyway people in England speak differently like every 5-10 miles so everyone is different here.
insert worthless quote here

'Mom' rhymes with 'Bomb'.
'Mum' rhymes with 'Bum'.
Comment on the way people pronounce 'Girl' depending on their regional accent in the UK.
'Girl' rhymes with 'Earl' in Canada & America.
'Girl' rhymes with 'Barrel' in parts of the UK.

different accent = different pronounciation,
e.g brits say route (root) and americans say it (rowt)

If Cat Deeley were talking to me you honestly think I'd care how she said America?

'ey, it jus' depend on which bita country your from as to how stuff sounds. I'm yorkshire, we don't say 'owt prop'ly!

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mum and mom sound the same anyway

I'm from Birmingham and I say AmericA. I also say 'mom' instead of 'mum' - the 'Am111cerican' way lol.

yea lol, im british but shes from birmingham and thats the way they speak, its wierd and can be annoying sometimes

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I live in Canada. Back when I went to high school, we had a Chemistry teacher who immigrated from the UK. Mr. Cruikshanks would say Canad-er and Americ-er. He'd pronounce a girl named Bonita as Bonit-er. We'd accept that as the way that he spoke.
But we didn't like how he'd pronounce Aluminum, "A-lu-min-ium" whereas North Americans would say "A-lu-mi-num", or Vitamin as "Vi-ta-min" (short 'I' as in 'hit') where Canadians & Americans pronounce it as "Vite-ta-min" {long 'I' - Vital to have Vitamins).
Canadians and Americans have difficulties understanding British accents the farther north the region the speaker is from. When I first heard Liz McClarnon of Atomic Kitten speak, I couldn't understand some of the things that she was saying because of her accent. I thought that she was from Scotland. I've since learned that she speaks with a Scouse accent. Her fellow Liverpudlian, Natasha Hamilton's accent isn't as strong.
Back to the topic: I've read on other posts at IMDB that people think that Cat Deeley has changed her accent since spending time in America. I've seen clips of her interviewing AK on CD:UK from a few years ago - I don't think that she changed accents. She doesn't sound like an American at all these days.

this argument could go on all dayI mean it annoys me when american people say erbs instead of HERBSbut I don't go on about it!!!

Tha knows tha mean.
Seeing is believing, Hearing is recieving. A Deaf and Blind World that I don't Believe in.
PWEI

True, but you guys say Aluminum..it's aluminium.ok.

Ooo you're from Birmingham too? Cool! I think it depends which bit you're from yep too and how strong your accent is.
E m i l y Susan S and Megan M Fan
http://susansarandonsite.tripod.com

Sorry i dont agree with that. I'm also from Birmingham. I say AmericA, and i know others who do too. Perhaps it depends on whereabouts in Birmingham yo're from?!
"I'm not from these parts. From a little place called England-we used to run the world before you."