Out with the old, in with the new ... butt. Here's Chelsea goalkeeper Thibaut Courtois on a yacht with a smokin' hot lady friend -- just months after breaking things off with his baby mama, Marta Dominguez. The backstory ... in April, Courtois announced he and Dominguez decided to call off their…

He's one of the BEST goalkeepers in the world ... and Chelsea superstar Thibaut Courtois says he's considering moving to the U.S. and playing in the MLS one day. The 24-year-old superstar was at a Hublot event in L.A. Thursday night -- when we asked if he would ever consider following in the…