Beyonce and JAY Z
Blue Ivy is doing her best as a big sister to her twin siblings, Rumi and Sir. Pictured: JAY-Z, Blue Ivy and Beyoncé attends the 66th NBA All-Star Game at Smoothie King Center on Feb. 19, 2017 in New Orleans. Getty Images/Theo Wargo

Blue Ivy is taking her job as big sister to younger twin siblings, Rumi and Sir, seriously.

Beyoncé and JAY-Z's eldest daughter Blue Ivy, 5, has reportedly been a doting sister to her newborn siblings. In fact, she assists the "Lemonade" singer with daily baby duties. "Blue is the best big sister," a source told People. "[She] helps Beyoncé every day."

The source added that the Carter family is doing great as a whole and has been enjoying the summer in Malibu. Blue Ivy is already excited to go back to school. Meanwhile, the twins are “growing and very cute.”

Queen Bey gave birth to her twins on June 13 at the Ronald Reagan UCLA Medical Center in Los Angeles, according to their birth certificate. Rumi arrived first and her twin brother, Sir, followed. Beyoncé's attending ob/gyn was Dr. Paul Crane, the same doctor who helped deliver "Keeping Up with the Kardashians" stars Kim and Kourtney Kardashian's kids.

Meanwhile, Beyoncé's mom, Tina Knowles, and husband Richard Lawson also praised Blue Ivy as an older sister. "She's very proud and very excited. She's a good big sister, she really is," Knowles told Entertainment Tonight.

"[Blue Ivy] cares for them a lot," Lawson added.

Earlier this month, Beyoncé and Blue Ivy were spotted attending and dancing together at Kendrick Lamar’s concert. The mother and daughter reportedly jumped and danced along with Beyoncé's pal, Kelly Rowland, and the "Halo" singer's cousin, Angie Beyince.

Prior to Beyoncé and Blue Ivy's concert date, the singer went out with JAY-Z. The couple enjoyed skating at World on Wheels roller rinks in Los Angeles. The pair kept their distance from their fans. According to the eyewitness, Beyoncé was quiet and did not interact with fans. She sported a black cap, black off-the-shoulder shirt and distressed jeans.

Prior to Beyoncé and JAY-Z's skating date, they were also spotted at Hollywood hotspot Sushi Park. The celebrities opted to occupy the table at the back of the restaurant and were reportedly very friendly with the staff. In fact, the "Empire State of Mind" rapper thanked the crew and caressed the Beyoncé's back when they made their way out.

A source revealed that the couple agreed to spend more time together following the birth of their twins. "They've been on a few dates since the babies were born," an insider told E! News. "They have reliable people helping out at home with the babies and Blue Ivy while they go out for a few."

What do you think of Blue Ivy as a big sister to her twin siblings? Drop a comment below.