Nothing says love like a willingness to rack up a boatload of frequent-flyer miles. It seems Miley Cyrus enjoyed a visit from back-on boyfriend Liam Hemsworth during the Bogota, Colombia, stop on her Gypsy Heart tour last week. "Thank you Columbia =] Had such a great time!" Miley enthusiastically tweeted on Friday. "So happy I was able to spend time and enjoy your beautiful country with my BOOOOO." But the ostensible BOOOOO in question might not appreciate the public gushing. After all, Hemsworth, 21, persuaded Cyrus to delete her personal Twitter account in October 2009, a move that left her 2 million-plus followers at loose ends until she recently rejoined the 140-character-or-less party to promote her tour.