In case it wasn't already completely obvious: Will Smith and Jada Pinkett-Smith's kids are getting ready to take over the world, whether we're ready or not. So it was only a matter of time until Willow Smith and her brother, Jaden Smith, set their sights on conquering the Twitterverse as well. While Willow is already something of a seasoned pro at tweeting, Jaden is new to the game, and it's all thanks to his pal, fellow teenage pop culture invader, Justin Bieber. On Monday, the Biebs stated, "Jaden needs twitter" and, as expected, he made it happen (he takes this "never say never" mantra very seriously, gang!) Jaden (pictured here with Justin) sent out his first-ever tweet later that evening, "Chillin with my bro @justinbieber." Then on Wednesday morning, Justin, apparently set on making this global takeover a partnership, posted, "everyone follow @officialjaden and get him to 500,000 followers today!"
But Justin and Jaden weren't the only ones looking out for each other today. Ian Somerhalder gave a big shout-out to his "Vampire Diaries" co-star (and his rumored off-screen love interest) Nina Dobrev for herTeen Vogue cover story, as he posted, "The lovely and talented @ninadobrev on the cover of TEEN VOGUE!Get it on mag stands&let the publishing world know how awesome she really is!" As did another one of "Vampire"'s leading ladies, Kat Graham, who wrote to her friend, "@ninadobrev covers teen vogue 
http://t.co/Z5wfRm3." A gracious Nina tweeted back, "THX;)"
Check out the rest of Wednesday's best celebrity tweets, including Ashley Greene's early morning venture to the "Breaking Dawn" set and Emily Osment's late night crush on Timothy Olyphant! Follow us @hollywoodcrush to get even more celebrity and pop culture news around the clock!
@ashleymgreene Thank you starbucks for being open at the crack of dawn!! Wow, it's early! But I'm excited!
-Ashley Greene, Actress ("Breaking Dawn," "Skateland")
@realmichellet On the set!! #GG http://yfrog.com/h6cd4szj
-Michelle Trachtenberg, Actress ("Gossip Girl," "Take Me Home Tonight")
@mirandabuzz Packing for NYC! Its times like these I wish I was Mary Poppins...
-Miranda Cosgrove, Singer, Actress ("iCarly," "Despicable Me")
@nerdist Alec Baldwin/Tina Fey sighting shooting scene outside 30 Rock. Resisted overwhelming urge to take pictures like a tourist. #squee
-Chris Hardwick, Actor, TV Host ("Attack of the Show!")
@emilyosment So completely cheating on both Daniel Tosh and Jon Stewart. Dear lord Timothy Olyphant. # 1 cowboy. Justified.
-Emily Osment, Actress ("Hannah Montana")
@jennymccarthy Watching Dumb &Dumber. So funny. That guy with the bowl cut is hilarious. I would totally sleep with him....oh wait.
-Jenny McCarthy, Author, Actress ("Scream 3")
@daxshepard1 Oreos. How is it possible that the one I just ate (my 15,000th), was as good as the first one I ever had?
-Dax Shepard, Actor ("Parenthood," "When in Rome")
@natehartley There are no certainties in life, except for you can never eat just one Oreo.
-Nate Hartley, Actor ("Zeke and Luther")
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