I can't to wait to tell you this news.
or
I can't wait to tell this news to you.
I can't wait to tell you the news.
I can't help telling you this news ,
【can't wait to do 迫不及待地干、 can't help doing sth 忍不住要干。。】
I can't help telling this news to you.
I can't wait to tell you the news.
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