The newly engaged couple reportedly jetted to Cabo San Lucas earlier in May in preparation for the wedding of Thom Mathews and Karla Jensen, which will take place on May 10.
Clooney arrived on a private jet 10 days before the wedding along with Alamuddin, Mathews and Benjamin Weiss. The foursome has reportedly been staying at the actor's vacation home.
Clooney and Alamuddin previously visited the actor's beach home back in December with friends Rande Gerber and Cindy Crawford. The couple allegedly got engaged last month after the Gravity star proposed with an "ethically mined" diamond estimated at 7 carats.
Alamuddin's firm in London confirmed the engagement in late April congratulating the couple "on their engagement to be married."