www.thediamondbathtub.com

What baby gift do you buy your best friend when she is one-half of the highest-earning couple in show business?

And what baby gift do you buy for that friend after you reveal to the world her most closely guarded secret, the gender of her unborn child?

If you are Kelly Rowland, you buy a bathtub.

Not just any bathtub, but a very expensive, Swarovski-crystal studded Baby Diamond Bathtub worth $5,200.  And you give it to your best friend, Beyonce.

The “Best Thing I Never Had” singer reportedly received the gift from Rowland, her former Destiny’s Child bandmate, in anticipation of the bundle-of-joy she’s expecting this February with husband Jay-Z.

Rowland famously let the gender secret the couple had been closely guarding slip when talking to reporters at the Cosmopolitan Awards in London earlier this month.

“I have no idea what I’m going to buy Beyonce at the baby shower because Jay is going to buy that little girl every single thing possible,” the singer, 30, told the UK’s BANG Showbiz.  “She won’t be spoiled but she will be very well looked-after.”

Well looked-after by both her parents and, evidently, her “Auntie Kelly,” as Beyonce told Closer magazine Rowland will be known to her child.

Crafted by California-based interior designer Lori Gardner, the baby-sized, footed, porcelain tub is covered in 44,928 imported crystals that Gardner reportedly spends more than two months applying by hand.

While Beyonce was gifted the pink version, the bling bathtub, weighing in at more than 3,000 pounds, is available in all the Swarovski colors.

Not to be impractical, the bathtub, according to the designer, can also be used for pets or as a beverage chiller for parties.  Just don’t expect to see any Cristal champagne chilling in any Baby Bathtub belonging Beyonce and Jay-Z’s baby offspring, of course.