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Rep. Nita Lowey (D-N.Y.) noted in her tweet that Clinton is her constituent. Clinton has a home in New York and represented the state in the Senate from 2001 to 2009. Sen. Kirsten GillibrandKirsten GillibrandSenators demand Pentagon action after nude photo scandal Chelsea Clinton to be honored by Variety, Lifetime Ten years later, House Dems reunite and look forward MORE (D-N.Y.), who replaced Clinton in the Senate, also tweeted recognition of the birthday of her "mentor, role model and friend."

Sen. Mark UdallMark UdallGorsuch's critics, running out of arguments, falsely scream 'sexist' Election autopsy: Latinos favored Clinton more than exit polls showed Live coverage: Tillerson's hearing for State MORE (D-Colo.) and Rep. Emanuel Cleaver (D-Mo.) also sent birthday tweets. 

The former first lady turned 65 on Friday. She does not have a public Twitter account. 

The official State Department schedule has the whole day blocked off for Clinton to celebrate her birthday, and includes a note that it "doesn't get more closed press than this," meaning the media is not invited to cover any plans. Clinton will be back on a plane Monday for a three-day trip to Algeria, Bosnia and Herzegovina, Serbia, Kosovo, Albania and Croatia.

Updated at 6:09 p.m.