This week's episode of "Keeping up with the Kardashians" is filled with some lighter moments in the Kardashian family. Expect to find some sister drama as the Jenners and the Kardashians bond over birthdays, pregnancy and babies, among other issues.

In the promo for the latest episode of E!'s reality show, Khloe and Kourtney Kardashian talk about their younger sister Kylie Jenner's 18th birthday party. Kourtney, the eldest of the Kardashian sisters, reveals that Kylie has planned a party for 300 guests, but they aren't invited. Upon hearing this, Khloe is aghast and calls her youngest sibling.

While Kylie does acknowledge that she hasn't invited them yet because the logistics of the party are still undecided, an affronted Khloe demands an apology. Nevertheless, this conversation happens in jest and the sisters laugh it off.

Meanwhile, a very pregnant Kim Kardashian is told about house rules by her mom, Kris Jenner. The mommager tells her daughter she doesn't want a lot of people in the Jenner household. Kim ignores this and asks if she needs more space for a nursery.

In another promo for Season 11, Episode 4, Kim tells her mom she's thinking about baby no 3. Kris is surprised and shocked, and asks her daughter to take it slow.

According to TV Guide, Season 11 Episode 4's synopsis reads: 

Kris meets Caitlyn for the first time when the family celebrate Kylie's 18th birthday; Kim takes over Kris's home (again) as she prepares for baby No 2; and Khloé tries to move forward with her life.

"Keeping up with the Kardashians" Season 11 Episode 4 airs on Sunday, 6 December at 8 pm on E!. You can live-stream the episode online via E! Live.