Mariska Hargitay chats with ET's Rachel Smith about Season 25 of 'Law & Order: SVU,' premiering Jan. 18 on NBC. The actress reacts to playing Olivia Benson on the show for 25 seasons and opens up about her 'deep' friendship with her co-stars, Chris Meloni and Kelli Giddish. Plus, Mariska reacts to Taylor Swift's sweet response to her cat named 'Karma.' New seasons of ‘Law & Order’ and 'Law & Order: SVU’ premiere Jan. 18 on NBC.