It looks as though 19 Kids & Counting fans can't stop speculating on which Duggar family sibling is going to tie the knot next. After sisters Jill and Jessa Duggar both tied the knot with their fiancés this year, many are guessing that their brother John David Duggar might be the next one to take the plunge.

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According to OK! Magazine on Tuesday, rumor has it that John has been dating a mystery girl. Although not much is known about her, her Instagram moniker is masiespace and she has supposedly been spending a lot of time with the Duggar family recently.

In one particular family photo, John is standing by the mystery brunette, with many fans guessing that they might be secretly courting.

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John himself opened up about his wedding plans, joking that he was "taking applications" during his sister Jill's wedding back in June.

"It was a joke," he told People over the summer. "But I hear that we started receiving applications like crazy. I don't know how many have come in and I haven't looked at any, but I hear there are a lot."

He added that many fans even took his joke seriously by reaching out to him with "advice about getting married."

John said, "It isn't a bad thing. I'm open to advice."

19 Kids & Counting airs on the TLC Network.

Tags: Duggars Reality TV TLC