Kat Von D may have been keeping her engagement to Jesse James, 41, under wraps in L.A. Wednesday night, but she wasn't shy about flashing her new sparkler!

PHOTOS: Check out these celeb engagement rings

The L.A. Ink star, 28, debuted the four-carat-plus platinum and diamond ring at the 16th Annual Los Angeles Art Show Opening Night Premiere Party.

The bauble, which comes from the Neil Lane archival collection, has a center diamond surrounded by smaller diamonds and a delicate filigree pattern with pretty scroll work.

"She absolutely loved her ring," Neil Lane tells UsMagazine.com.

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And while she didn't open up about the ring's significance at the event -- "How do you know we aren't already married," she joked -- she was willing to gush about the man behind the bling.

PHOTOS: Jesse's messy split with ex wife Sandra Bullock

"I feel really lucky," she told Us of her motorcycle mogul beau of about six months. "I think in the past I thought I knew what love was. I think I am growing up a lot too and realizing the truth in a lot of things and feel really blessed now."

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