Twitter index: Rihanna and Britney duet has Twitterers a flutter

Pop divas Britney Spears (@britneyspears) and Rihanna (@rihanna) teased their fans with cryptic tweets about a soon to be released collaboration between the two singers.

"I got a #SEXY collabo comin your way supa dupa soon!!!! OH YEAH!!! By popular demand...." tweeted Rihanna, leaving her fans questioning whom she would team up with for almost an hour before adding "Its BRITNEY BITCH!!!!"

Excited fans tweeted "Omgg, Rihanna And britney duet on S&M, give me it nowww, im so excited!!" and "Love that Rihanna & Britney are collaborating-two big artists, one big song. I'm ready for it, are you?" after hearing the news that Spears would be featured on Rihanna's "S&M" remix.

American cable TV channel Comedy Central reminded people to tune into the first annual Comedy Awards with first place hashtag "#ComedyAwards."

"#itssadwhen," "#themostannoyingtweeters" and "#enmiinfancia" filled second, third and fourth places on the chart.

The name of Mexican singer and actress "Danna Paola" is in fifth place, the name of a new TV show featuring Khloe Kardashian and her husband, " Khloe & Lamar," is in sixth place, and the name of South African golf player "Charl Schwartzel" is in eighth place.

"Deltas" is in ninth place and "FCAT," short for the Florida Comprehensive Assessment Test, is in tenth place.

The top 10 most talked about topics on Twitter on April 11 at 6:30 AM GMT are:

1. #ComedyAwards (promoted)
2. #itssadwhen (new)
3. #themostannoyingtweeters (new)
4. #enmiinfancia (new)
5. Danna Paola (new)
6. Khloe & Lamar (new)
7. Rihanna & Britney (new)
8. Charl Schwartzel (new)
9. Deltas (new)
10. FCAT (new)