Here's our round-up of singers', rockers' and rappers' 20 coolest and funnest tweets from the past seven days. Be sure to tag @billboarddotcom to your favorite music retweets (and don't forget to follow us!)

@TheEllenShow (Ellen DeGeneres):It's my birthday tomorrow! All I want for my birthday is world peace, and a lock of @JustinBieber 's hair.
@justinbieber : @TheEllenShow i think i can make that happen. i know people that know people that know people. those people also know people.
@kanyewest: NO ALCOHOL BEFORE TATTOOS
@drakkardnoir (Drake):They say the nicest things about people at their funerals...shitty that I'll miss mine by a couple days.
@jason_mraz: Just realized I've been taking a women's one-a-day vitamin. That might explain why I've been so sensitive... ...around the nipples.
@50cent: I don't know why people underestimate me. I just shut down WORLDSTAR for future advertising contact thisis50.com suckers lol
@therealswizzz (Swizz Beatz): HAPPY BDAY TO MY QUEEN!!!!!!!!!!!!!!!
@AliciaKeys: OMG! I'm over here crying from this beautiful & thoughtful site u guys did 4 me! U mean so much 2 me! http://happybirthdayalicia.tumblr.com
@britneyspears:Day 1 of the HIAM shoot with Jonas. Such an incredible experience. I think this will be one of the best videos I have ever done. -Brit
@doctorfollowill (Nathan Followill of Kings of Leon): Good morning. Slept like a log, woke up in the fireplace. Off 2 rehab 2 get hurt for 90 minutes. Pain pill 4 breakfast. Dear pain, fuck off.
@SouljaBoy: I like college girls. I met this girl the other day that was smart af blew my mind. i'm like shit I just wanna listen to you talk all day
@JoeBudden: niggaz can't even find @MARLONLWAYANSin B movies tho ... 4real, what in the fuck is he doin that makes him "funny"
@JeanGreasy(Jean Grae):To whoever did the 15 blocks of giant snow smiley/frowny faces on trees on the Upper East Side, I love you.
@elliottyamin:Sometimes I wish I could take the 2 phone books per week (that pile up on my porch) and use them as seeds 2 replant trees! #whatawaste!
@joshgroban: Tokyo, I love you but there's an eye in my soup.
@AvrilLavigne :WTH!! Please no more chips in my dressing room.... Ill eat them all...
@jasonderulo: I've eaten the same blackened salmon everyday since I've been working on this album! It's soooo gooood!
@yelawolf: You may ask you're self ... Why do I have a casket in the back of my chevy ? ... http://yfrog.com/gz3h6gmj" target="_blank
@NatalieGrant:Very little sleep last night. I've brushed my teeth. But getting to wash my hair is still questionable. #momofanewborn
@siamusic (Sia Furler): i'm drowning my sorrows with a 7/11 travel pack of fruit loops. and an episode of celeb rehab. can dr. drew cure me of froot loops?
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READ LAST WEEK'S TWEETS