Is Jamie Lynn Spears picking sides? On Saturday, March 2, the actress was spotted at the final show of Christina Aguilera’s Las Vegas residency. This isn’t the first time the Zoey 101 alum, 32, supported the blonde beauty, however, it still comes as a surprise to fans since Spears’ sister, Britney Spears, isn’t on the best terms with the “Genie in a Bottle” crooner, 43. Then again, Jaime Lynn and her sibling have also been estranged for years. Social media was stunned to see Jamie Lynn in the crowd, with one person tweeting, “What is she doing there?” “Jamie Lynn Spears attending the concert i…