Karine Jean-Pierre shakes off pre-speech jitters with Taylor Swift and Beyoncé! The White House press secretary revealed her routine while preparing for a big day. This includes taking a few minutes to look over her notes, eating a mint, making sure her hair and makeup are on point — and even dancing! Jean-Pierre shared that before her very first White House press briefing, Jen Psaki played the Beyoncé song “Run the World (Girls)” to help pump her up. It’s since become a pre-briefing tradition. “It’s always a woman. It’s either Taylor Swift, Beyoncé, or Rihanna. I love Missy Elliot, as well,” …