They've been dating on-and-off for about four-and-a-half years -- including being "off" for at least three months last year, but a report says that Mickey Mouse Club-turned-*NSYNC-turned-The Social Network star Justin Timberlake popped the question to 7th Heaven-turned-New Year's Eve star Jessica Biel and the couple is now engaged.
Justin reportedly asked Jessica to marry him while they were in the mountains in Jackson, Wyoming.
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Neither star has officially confirmed or denied the news -- and Justin has yet to Tweet since Christmas Day.
Justin has dated Britney Spears and Cameron Diaz and Jessica has been linked to 7th Heaven costar Adam LaVorgna as well as baseball star Derek Jeter.
Comment below with your congratulations messages to Justin Timberlake and Jessica Biel!