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Proud son.

A photo posted by Brandon Jenner (@brandontjenner) on

Brandon Jenner is sending a lot of love his dad's way.

Bruce Jenner's son posted a truly adorable Flashback Friday photo of him sitting on his Olympian dad's shoulders as a little boy—and Brandon was the spitting image of his father, the Jenner genes shining through in their matching smiles!

"Proud son," read Brandon's simple caption. He and younger brother Brody are Bruce's sons with second wife Linda Thompson.

Brandon's supportive shout-out comes ahead of the premiere of his dad's much-anticipated sit-down with Diane Sawyer, airing tonight on ABC.

Kim Kardashian told E! News that they would be watching the interview all together tonight with Bruce as a family.

Brandon, meanwhile, is expecting his first child with wife Leah Jenner, which will add another grandbaby to the brood for Bruce, who's also grandpa to Kourtney Kardashian's three kids with Scott Disick and Kim and Kanye West's daughter North West.

Don't miss a new episode of Keeping Up With the Kardashians, Sunday at 9 p.m. on E!