Country star Blake Shelton has postponed plans to propose to singer girlfriend Miranda Lambert, until he can afford to buy the $450,000 ring she has already chosen.

The pair have been dating for four years, and Shelton admits he was planning to ask her to be his wife, until he discovered how much an engagement will cost him.

He tells Us Weekly, "I thought we were getting a little closer until she took me to Tiffany's to show me the ring she wanted. It was a $450,000 pink diamond. I probably need to save a bit longer before I'm ready for that."

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