Looks like things are going strong between Ashley Greene and Joe Jonas -- because she celebrated her birthday with him by her side this weekend in Las Vegas!

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Ashley, who turns 25 today, had her hands all over her 21-year-old boyfriend last night at Pure in Caesars Palace.

Joe reportedly got Ashley the gold Chanel charm bracelet she was wearing during the party, Greene telling PEOPLE ""It was very cute and sweet and adorable to me because my boyfriend gave it to me. Coach, Chanel, [it] makes no difference to him ... [But] I absolutely love it because he knows what I like."

Check out all the party pics!

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