Taylor Swift‘s worldwide album sales have now topped 20 million, including 10 million sold during the past 18 months. The announcement was made Wednesday (March 30) in London prior to her sold-out concert at the 02 Arena. International sales totals for her 2006 self-titled debut album now exceed 5.5 million. Global sales exceed 8.6 million for 2008′s Fearless and 4.8 million for Speak Now. Released only in the U.S., The Taylor Swift Holiday Collection has sold 788,353 units and Beautiful Eyes 257,047. The latter title was available only at Walmart stores. The London concert completed the European leg of her world tour. Her North American tour begins May 27 in Omaha, Neb. Swift is nominated in three categories at Sunday’s (April 3) ACM Awards show taking place in Las Vegas. In addition to a nomination for entertainer of the year, she’s also up for top female vocalist and album of the year (Speak Now).