(L) Blue Ivy and Beyonce, (R) Beyonce in 4:44 Puma Sneakers (Instagram)

(L) Blue Ivy and Beyonce, (R) Beyonce in 4:44 Puma Sneakers (Instagram)

*Beyoncé and Jay-Z were reportedly concerned that their 5-year-old daughter Blue Ivy would “feel left out” after the June 13 birth of her twin siblings Sir and Rumi, but it turns out there was nothing to worry about.Big sis has completely bonded with her brother and sister, a source tells PEOPLE.

Before the babies arrived, Bey “made sure to spend lots of quality time” with Blue, says the source. “There was no need to worry because Blue is great. She takes her job as a big sister very seriously and helps out a lot.”

As previously reported, Blue’s parents recently closed on an $88 million Bel-Air mansion located closer to her school, where she’ll start attending in the coming weeks.

“Blue is excited about starting kindergarten,” says the source. “She misses her friends. It will be fun for her to get back to her own life at school. Beyoncé is excited for her too but keeps saying that she can’t believe Blue is starting kindergarten. She thinks Blue is growing up way too fast!”

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Meanwhile, Beyonce posted the above gif on Instagram Wednesday (Aug 23), which shows her in a series of pricy items that also promote her husband’s new album “4:44.”

Edited to the album track, “Caught Their Eyes (feat. Frank Ocean),” Bey is shown in Stella McCartney’s $765 (on sale for $383) t-shirt dress, a Virgil Abloh Off-White “See Now Buy Now” crossbody bag and a pair of custom 4:44 baby pink Puma’s with the album’s tracklist printed on the inner sole and 4:44 album barcode embossed on the side.

4:44 Puma sneakers

Beyonce’s limited edition 4:44 Puma sneakers (Pair 1 of only 44 made).

Only 44 pairs of those leather and rubber Puma Clydes were made (Bey’s pair is 1:44) and they’re currently not even available on resale sites, according to Billboard. But Jay’s tour is still in rehearsal mode (first show is on Oct. 27) and a Tidal x 4:44 and Puma collaboration was confirmed to Billboard less than a month ago, so there’s still hope that the sneakers will eventually become widely available.