He wrote: "This woman just poured her heart out on stage at the Royal Albert Hall. Whoever was there got to witness something special. Wow."
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The "22 Jump Street" star also shared an additional post from the concert on his Instagram story with the caption: "She went off tonight!"
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After seeing the posts, fans became convinced that Tatum was making their relationship official.
Many were quick to tell Tatum that he was "in love," while others agreed with him and said that Jessie J is a talented singer.
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@channingtatum @JessieJ You... @ Josie M.
@channingtatum @JessieJ sup... @ Nicola
@channingtatum @JessieJ I l... @ Heartbeat_khimmy
@channingtatum @JessieJ I w... @ Emma
@channingtatum @JessieJ THE... @ Amanda Souza
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@channingtatum @JessieJ Soo... @ Melanie Walton
@channingtatum @JessieJ we ... @ cinthia#emo#
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Since the two stars' reported relationship was revealed in early October, Tatum and Jessie J have been spotted supporting each other at several events.
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It's unclear how or when Tatum and the "Domino" singer met, but the two shared the stage at the 2015 MTV Movie Awards. During the show, Jessie J and Mark Wahlberg presented the 38-year-old with the award for best comedic performance.
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