The gay couple, who got married yesterday, were feted by friends Leah Remini, Rebecca Romijn and husband Jerry O'Connell, Alicia Silverstone, Jane Lynch and Kenneth Cole, reported Us magazine.
The couple's dog named Billie Jean played a special role in the ceremony and walked down the aisle.
Jackson, 39, and Landau got engaged six months after the former, who came out as gay in 2005, ended his 13-year relationship with husband Monte Lapka.
They first went public with their relationship in October 2013.
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