Jennifer Aniston has still got it. The actress - who turned 40 this past February - flaunted her bikini in Cabo San Lucas, Mexico, over the weekend while vacationing with pals at the exclusive One and Only resort. On Friday, she went sunbathing in a tiny purple bikini.

Look back at Jennifer Aniston's red carpet looks through the years Aniston could use the vacation. The new Us Weekly (on newsstands now) has the exclusive first look at what's really inside a shocking new tell-all about the couple. See Jennifer Aniston's most romantic moments with John Mayer

Brangelina: The Untold Story of Brad Pitt and Angelina Jolie reports that Jolie, 34, waged "a mean-spirited but effective campaign" against Aniston around the time that Pitt, 45, divorced her. See what Jennifer Aniston and other stars look like with fangs According to the book, Jolie spread the rumor that Aniston firmly prioritized her career over starting a family -- which put her directly at odds with Pitt, who ached for kids. Jolie "was convinced that this is the story that would resonate with all these women who saw her as a man-stealing bitch," Halperin writes.

See more photos of Jen Aniston in her bikini in Mexico at PopSugar.com! For more on Jolie, Pitt and Aniston - including the truth behind Jolie and Pitt's supposed infidelity, their absentee parenting and Jolie's warning" to look-alike Megan Fox - pick up the new issue of Us Weekly today!