Merrygold confirmed to The Mirror that he is dating 28-year-old Sarah Richards.
"I'm dating, we've been seeing each other for a couple of months," Merrygold said. "It's all going really well - we're really happy."
A source also told the paper that Marvin Humes's recent wedding had encouraged his fellow bandmates to think about settling down, saying: "Aston has always been the womaniser of the group. He has never been ready for a relationship but has fallen head over heels for Sarah.
"There is such a spark between them and all the boys have been saying what a cute couple they make."
It was recently confirmed that Merrygold will replace Adam Garcia on the next series of Sky1's Got To Dance.
Watch JLS's video for 'Proud' below: