It's then you realise the picture was probably taken after the ceremony, though if they got married in comfortable clothing and didn't get gouged by those robber barons in the wedding-dress industry, respect.
Phelps and Johnson reportedly began dating all the way back in 2007, after Phelps had become an Olympic champion but before he'd become an Olympic immortal with his eight-gold performance in Beijing.
They broke up and got together and broke up and got together, according to those celebrity rags, before getting engaged three months before Boomer was due.
The newborn was a constant presence at Phelps' final races - at U.S. Trials and the Olympics - usually wearing custom-made headphones for the sound and not leaving the arms of his mom.
Phelps had been asked before the Olympics what he expected out of his big day. "Small wedding, big reception," he said. "That's what we want."
And quiet too, apparently.