as her beau Big Sean claims he never tweeted a threat to Believe singer He surprised Ariana Grande fans by hitting the stage for a sultry duet with the star .\r<br>\r<br>Ariana Grande lashed out at Big Sean almost immediately after their breakup by staging Justin Biebers come-from-behind stage embrace . so claim sources .\r<br>\r<br>Big Sean believes Ariana Grandes hug with Justin Bieber was calculated Daily Mail - 3 hours ago . Ariana Grandes recent performance, in which Justin .\r<br>\r<br>WTF !!!!\r<br>\r<br>As long as you love me (live) by Ariana Grande ft. Justin Bieber.
