Christina Aguilera named her baby daughter WHAT!?

Christina Aguilera must be over the moon since welcoming her baby girl to the world on Saturday. The mom of two didn't waste any time revealing her daughter's name to fans over the weekend. Less than 24 hours after giving birth at Cedars-Sinai Medical Center in Los Angeles, the pop singer posted a sweet message on Twitter revealing the creative name she and fiancé Matt Rutler picked out for their bundle of joy. You won't believe what it is…

__Read more ¿Qué más?: Christina Aguilera may pose for 'Playboy' after giving birth!? 
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Aguilera posted to fans, "So proud to welcome our beautiful daughter Summer Rain Rutler into the world." It is pretty sweet that they didn't go with a generic name. Summer Rain sounds like such a 1970s hippie name, and there is nothing wrong with bringing back some flower power.

We are sure big brother Max must be thrilled over Summer's arrival. Xtina posted a photo of her eldest son holding her baby belly on Twitter with the caption, "Max already protecting mommy & his little sister! He's the greatest #maxthegreat." What a beautiful family! We are thrilled for the happy couple. Congrats, Christina!

If you thought Christina's baby name choice is a little strange, check out 12 other celebs who named their kids some pretty far-out names! –Additional reporting by Michelle Regalado

Image via Getty Images

Lil' Kim

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Getty Images

Lil' Kim picked a very, err, regal moniker for her new little girl. Royal Reign! That's right … of all the names on the planet, she went with Royal Reign. I guess Lil' Kim really wanted her little girl to feel like a princess.

Beyonce & Jay-Z

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Beyonce and Jay-Z raised eyebrows when they decided to name their first (and thus far, only) child, Blue Ivy.

Kim Kardashian & Kanye West

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Vogue Magazine

After much speculation, Kim and Kanye eventually decided to name their child North. Which would probably be OK … if her last name wasn't West. Still not over that one!

Gwyneth Paltrow & Chris Martin

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Gwyneth Paltrow and Chris Martin jumped on the weird baby name craze when they named their first child Apple. Their son is named Moses.

Jessica Alba & Cash Warren

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Jessica Alba and Cash Warren went untraditional with both of her daughters' names, deciding on Honor for the eldest and Haven for her little sister.

Nicole Richie & Joel Madden

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Never one to follow convention, Richie named her daughter Harlow (which also inspired her jewelry and clothing company name House of Harlow) and her son, Sparrow.

Mariah Carey & Nick Cannon

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Mariah Carey and Nick Cannon didn't go too out of the box with their daughter's name, Monroe, but decided to go for something a little funkier for their son's name, Moroccan.

Kate Winslet & Ned Rocknroll

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Kate Winslet gave her first child with husband Ned Rocknroll an usual name, to say the least–Bear Blaze. At least, she didn't also give him her husband's last name "Rocknroll" and decided to use her own maiden name instead!

Freddie Prinze Jr & Sarah Michelle Gellar

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Though the couple went with a popular girl name, Charlotte, for their first child, they decided to go a little less traditional with their son's moniker, naming him Rocky after the famous Sylvester Stallone movie.

Holly Madison & Pasquale Rotella

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InTouch

The former Playboy model named her now 1-year-old daughter Rainbow Aurora.

Jason Lee & Beth Riesgaf

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Perhaps the weirdest name of all is Jason Lee's choice for his first child. The actor famously named his son Pilot Inspektor. Poor kid!

Robert Rodriguez & Elizabeth Avellan

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The Sin City director and his wife chose completely off-the-wall names for his four sons: Rebel, Racer, Rocket and Rogue. At least he went with Rhiannon for his daughter!