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"Christina Aguilera had a bittersweet Tuesday night, saying farewell to The Voice while ringing in her 32nd birthday.&amp;#xA0;\r\nBut on Saturday, there was nothing bitter about the &amp;quot;Your Body&amp;quot; songstress&amp;apos; surprise birthday bash.&amp;#xA0;\r\nAguilera headed out of her Beverly Hills home to run holiday errands and do a little Christmas shopping Saturday, a source told Us Weekly. In the meantime, boyfriend Matt Rutler and a few close friends quickly set up decorations for the surprise party.\r\n\r\nUpon her return home, Aguilera found 20 of her closest pals waiting for her, as well as a two-tiered black, pink and white cake from Vanilla Bakeshop.\r\n\r\n&amp;quot;There were tons of balloons throughout the house,&amp;quot; the source said of the party. &amp;quot;Christina was completely surprised. She was very happy.&amp;quot;\r\nGuests to the fashionable fete - Aguilera&amp;apos;s home was decorated in the same shades to match the cake - included Nicole Richie and Blake Shelton (wife Miranda Lambert was out of town), and featured a smorgasbord of finger foods, including mac n&amp;apos; cheese, mini chili dogs, deviled eggs and grape leaves.\r\n\r\nEven Aguilera&amp;apos;s son Max, who will turn 5 in January, was on hand to enjoy the festivities.\r\nThe proverbial icing on the cake?\r\nAguilera&amp;apos;s friends tested out their pipes with a rousing rendition of &amp;quot;Happy Birthday&amp;quot; when the birthday gal walked through the door.\r\n\r\n&amp;quot;Everyone was very friendly and got along well,&amp;quot; the source said. &amp;quot;They had a great time.&amp;quot;\r\nOn Tuesday, Aguilera kept the party going at the afterparty for The Voice finale, donning a Santa hat, a ripped Mickey Mouse T-shirt and fishnet stockings.\r\n&amp;quot;Thank you #Fighters for the many sweet birthday messages today!&amp;quot; she tweeted. &amp;quot;Let There Be Love to you all! XoXtina.&amp;quot;"^^<http://www.w3.org/2001/XMLSchema#string>
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