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Taylor Swift continues to welcome guests to her shows.  The country-pop star closed out her four-show stint at the Staples Center in Los Angeles Saturday with a bang. 

She invited pop superstar Jennifer Lopez to join her on stage to sing what she called the "hairbrush song" of her childhood - J. Lo's "Jenny From The Block."  Swift told her audience that the 2002 hit was one of her favorites, and she used to dance to the tune and sing along, belting out the tune into her hairbrush "microphone." 

After the surprise appearance, Lopez took to Twitter to thank Taylor for "inviting [her] family to be a part of yours" and posted pictures of them together in her dressing room. 

Lopez capped off an impressive list of guests who joined Taylor for her L.A. shows last week.  Taylor's four-night stand also featured guest appearances from Ellie Goulding, Sara Bareilles, Tegan and Sara and Cher Lloyd.  

Saturday's show at the Staples Center also marked a career milestone for Taylor.  It was Swift's eleventh sold-out show at the Los Angeles stadium, which is the most of any solo artist in the venue's history.