Miley Cyrus is reportedly not giving Kellan Lutz the "relationship that he wants".

The 21-year-old singer and 28-year-old actor are believed to be dating and were spotted getting cosy in Las Vegas over the weekend.

After splitting from her fiancé Liam Hemsworth in September, Miley is said to be enjoying single life. However, Kellan is reportedly keen to settle down and thinks the blonde star could be the one for him.

"They have hooked up and will probably hook up again but Kellan is in it more [than] Miley. He is enamoured by her," a source told HollywoodLife.com.

"But Miley is strictly having fun and doesn't want to get serious, so Kellan better play it cool or he will not get to hook up with her anymore - she isn't giving him the relationship that he wants."

According to E! News, Miley and Kellan put on a public display of affection at Beacher's Madhouse at the MGM Grand Hotel & Casino in Sin City last Friday.

An onlooker shared how the pair couldn't keep their hands off each other throughout the night.

"They were making out and didn't seem to care who was watching," a source revealed.

"It wasn't a secret that they were together. She kept grabbing him throughout the night, pulling him with her as she went to leave the venue around 3:30 a.m. You can tell he was into her."

It was only after Miley and Kellan were spotted sharing a private jet earlier this month that they were romantically linked. They have been friends for years but it is believed this moment changed their feelings towards each other.

They have known each other forever. They have always been good friends but it turned romantic a couple of weeks ago," an insider explained.

"They have very similar outlooks. I am not sure if it has a future but they have great chemistry so for the time being they are just having fun. Neither of them is planning anything long-term right now, they are just enjoying themselves. They are both spontaneous, fun people, so their personalities match."

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