Newly-wed couple and '19 Kids & Counting' stars Jessa Duggar and Ben Seewald recently had dinner on Monday with Duggar's older sister Jill and her husband Derick Dillard, US Weekly reported.

Duggar's sister Jill, who is pregnant with her first child, posted photos of the double date family dinner on her Instagram account, showing both couples enjoying a meal together. She captioned it with "So fun to hang out with our siblings! #familydinner #19kids #beansandcornbread."

Jessa and Ben also joined the married couple in attending a Christmas recital held at the Duggars' Arkansas home, which Jill also posted about.

The Duggar sisters' friendliness towards each other confuses some of their fans, especially as rumors claimed that the two passive aggressively argue with one another.

Allegedly Jill stopped following her on Twitter and Seewald was noted to have stopped following brother-in-law Dillard. People are also noting that while Duggar is still following her older sister, she did not make a congratulatory post on her pregnancy and also did not post frequently about her.

The sisters have not addressed the speculation, though Duggar did post a picture of the Bible verse, Philippians 3:12-15, on her Instagram, and wrote, "Forget what lies behind. Strain forward to what lies ahead. Press on toward the goal for the prize!"

In related news, on Dec. 1, Jessa Duggar and Ben Seewald celebrated the first month anniversary of their marriage.

They both posted pictures of them in their respective Instagram and Facebook accounts, with Duggar writing "Today we're celebrating our 1'monthiversary!'." Duggar also wrote to her husband, saying "I'm blessed to call you mine," and Seewald replied in turn with, "I married my best friend! I love you, Baby!"

The couple married on Nov. 1 at the First Baptist Church in Bentonville, Arkansas. Duggar's sister and Dillard were in attendance at the event, along with all of Duggar's siblings, parents and family friends.