Robert Pattinson and singer FKA Twigs are believed to be engaged after dating for nine months, and based on her most recent, sultry photo, it's fairly easy to see the reason why the Twilight actor wants to marry her ASAP.

The "Two Weeks" singer posed completely naked in her bathtub and used her hands and legs to cover her sensitive body parts. The snap was shared by Karen Clarkson, her fashion stylist, on Instagram after they went to Wattens Austria to attend Swarovski's Crystal World reopening event last Tuesday. Karen captioned the photo, "Always have a bath before bed."

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Twigs tied her curly hair up and gleefully posed for the camera and gave a subtle smile.

Earlier that same night, the singer sported a ring on her engagement finger, which many believe is the sparkler Robert gave her. The 27-year old singer looked stunning in a light green, sparkly dress and showed off her eclectic style by finishing her look with black and red flamenco sleeves and knee-high gothic boots.

Her dress was a wonderful choice for the jeweler's gala as she hung out with Julia Langes-Swarovski and Markus Langes-Swarovski. Twigs, who is known for being a unique fashionista, even spent some time mingling with French designer, Jean Paul Gaultier.

Twigs was last seen with her boyfriend or possibly fiancé, Robert, on Friday, leisurely walking around Venice Beach in LA. The adorable couple, who were introduced by mutual friends, walked holding each other's hands as they enjoyed some ice cream.

Twigs gave fans a first look at her engagement ring during the day but offered a clearer look on Tuesday when she wore it again for the Swarovski event.

Meanwhile, Twigs might be staying in the United States for a while, as she is going to perform in New York in the next two weeks. She will be taking the stage at Brooklyn Hangar for the Red Bull Music Academy Festival, which will kick off on May 17 and end on May 19.

TagsFKA Twigs, Robert Pattinson, Swarovski