Cute overload! Holly Madison's baby daughter, 4-month-old Rainbow Aurora, is one adorable little girl. Case in point: This sweet photo of the tot that Madison, 33, shared on Twitter on Tuesday, July 2.

"My baby just lounging in my bathroom..." the Girls Next Door alum tweeted of the shot, with a link to a post about the little bundle of joy on her blog.

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"I love having a little swing or seat for baby Rainbow in my bathroom," Madison wrote alongside the picture of the infant lying in a colorful, cushioned pod. "This one is a MamaRoo seat that plays music, and has a little mobile for her to look at. She's quite intrigued by this feature, as you can tell by the contemplative look on her face. It lets her feel comfy and close to mom while I am doing my hair and makeup or taking a shower."

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Madison also shared pictures on her blog from Rainbow's first vacation -- a trip to Electric Forest in Rothbury, Mich. "Rainbow was an angel on her first vacation," the proud first-time mom bragged. "We had fun of course going to the festival but also roasting marshmallows, visiting the petting zoo, and just hanging out in the hammock in front of the cabin."

The former Playboy model and boyfriend Pasquale Rotella welcomed their first child together on March 5. A little more than three months later, Madison announced their official engagement on her blog. (She had previously written about planning their wedding, but Rotella didn't actually propose until June 23.)

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"My fiance was so wonderful in creating such a romantic night! He proposed to me at the top of the Ferris wheel at EDC Las Vegas," she gushed on June 24. "I was so happy that so many of our close friends were there to share the wonderful moment with us. We rode around the festival on the art car until the sun came up! I couldn't have asked for a more wonderful or magical proposal!"

This article originally appeared on Holly Madison Shares Adorable New Photo of Daughter Rainbow Aurora "Lounging"