Twitter index: Justin Bieber's mother's birthday, Autism Awareness Day

Justin Beiber's mother Pattie Mallette

Twitter users around the world are celebrating the birthday of Pattie Mallette -- Justin Bieber's mother -- and marking Autism Awareness Day.

Tributes to Pattie Mallette are occupying the first, third, and seventh place trending topics with "#ThankyouPattiefor," "We Love You Pattie" and "Pattie Is Our Inspiration." "#ThankyouPattiefor caring,loving, & making Justin happy.We're so thankful to you for all you've sacrifice [sic] for Justin," and "#ThankyouPattiefor having justin and never giving up on him.....WE LOVE YOU, HAPPY BIRTHDAY MOM PATTIE<3," tweet microbloggers.

Pattie Mallette (@pattiemallette) herself has over one million followers and her Twitter bio reads "Yes Justin Bieber is my son. I have many other great qualities besides being his mom haha! No really."

Various other trending topics related to Pattie Mallette, including "Happy Birthday Pattie," have been popular on Twitter since this morning. 

Twitter users are also raising awareness for Autism Awareness Day with the hashtag "#autismawarenessday" and expressing excitement over the confirmation of a sequel to the 1994 Jim Carrey movie Dumb and Dumber.

Grand Prix motorcycle racer Dani Pedrosa is also making news on the microblogging site after allegedly being arrested for trying to fraudulently obtain a yachting license, as is rugby player Gavin Henson, who was sacked by his team Cardiff Blues after allegedly behaving "drunkenly" on a flight on Saturday.

Kendrick Lamar's new song "The Recipe" is also popular amongst Twitter users, trending in ninth place.

The top 10 most talked about topics on Twitter on April 2 at 3:30 PM GMT are:

01.   #ThankyouPattiefor
02.   #autismawarenessday
03.   We Love You Pattie
04.   #BestTimeToSmokeWeed
05.   She Thick AF
06.   Dumb And Dumber 2
07.   Pattie Is Our Inspiration
08.   Dani Pedrosa
09.   The Recipe
10.   Gavin Henson