Whitney Jensen is 19, blond, beautiful, and Boston Ballet’s shooting star. A native of Park City, Utah, Jensen was just 17 when she joined the company. Even then she had a notable career behind her, having danced Clara in the “Radio City Christmas Spectacular’’ in New York City at ages 11 and 12 and received the highest award possible at the 2008 Varna International Ballet Competition in Bulgaria. At Boston Ballet, she was promoted to second soloist in 2010 and soloist in 2011. Already she’s been a sensuous Gamzatti in “La Bayadère,’’ a leggy, exuberant Polyhymnia in George Balanchine’s “Apollo,’’ the high-school bombshell in William Forsythe’s “The Second Detail,’’ and a vision of Botticelli’s Venus in Jerome Robbins’s “Afternoon of a Faun.’’ She dips on pointe while in second position with embarrassing ease; she looks equally at home in the Cubist displacements of Boston Ballet resident choreographer Jorma Elo. Can a promotion to principal be many years away? Not likely.