The President and the First Lady will be among the A-list guests at the Washington wedding of Treasury Secretary Steven Mnuchin Saturday evening.

Mnuchin, a 54-year-old billionaire former Goldman Sachs exec, is set to wed 36-year-old Scottish actress Louise Linton at the Andrew W. Mellon Auditorum, five blocks from the White House.

The hush-hush nuptials were a closely guarded secret until Wednesday, when Commerce Secretary Wilbur Ross spilled the beans while introducing Mnuchin at a conference.